Core Education: Scar Biology, Scar Types, and How Hypertrophic Scars Form

Your skin heals in phases. That timeline matters because hypertrophic scars usually become noticeable during the later part of healing, when collagen is being reorganized.

The wound-healing phases, in plain language

Inflammatory phase (0 to 7 days): Your body stops bleeding, fights bacteria, and clears damaged tissue. Redness, warmth, and swelling are common and expected.

Proliferation phase (7 to 21 days): The wound “fills in.” New blood vessels form, and collagen is laid down quickly to rebuild strength.

Remodeling phase (21 days to 2 years): Collagen gets reorganized. A scar can soften, flatten, and fade, but it takes time. Many scars reach a more stable look around 6 to 24 months.

What makes a scar “hypertrophic”?

A hypertrophic scar is raised, often red or pink, and can feel firm or itchy. The key feature is that it stays within the boundaries of the original wound or incision.

From clinical experience, hypertrophic scars are common after surgeries that involve tension on the incision line (like shoulders, chest, knees, and the abdomen), and after wounds that take longer to heal or become inflamed.

Hypertrophic scars vs keloids vs other scar types

Patients often use the word “keloid” to describe any raised scar, but true keloids behave differently.

• Hypertrophic scars: Raised and red, but confined to the wound edges. They may improve gradually over time.
• Keloids: Raised and may extend beyond the wound into surrounding skin. They are more likely to persist and recur, and they occur more often in people with darker skin tones and a family history.
• Atrophic scars: Indented or “sunken,” common after acne (ice pick, boxcar, rolling).
• Contracture scars: Tightened skin, often after burns, which can restrict movement.

If you want a broader overview of scar categories and why they behave differently, see our introduction to scar types, causes, and treatments.

Key Factors: What Affects Scar Healing and Appearance

The reality is, scar outcomes are not a simple reflection of how “well” you took care of yourself. Your genetics, skin tone, location on the body, and how the wound was closed all matter.

Tension, movement, and scar thickness

Incisions that are pulled in different directions all day tend to lay down more collagen. This is why scars on the chest, upper back, shoulders, and joints often become thicker. Even a well-closed incision can become raised if your skin is constantly stretching over it.

Inflammation and delayed healing

Anything that increases inflammation can increase the risk of hypertrophic scarring. Common examples include wound infection, friction from clothing, persistent scabbing that repeatedly cracks, and picking at the area.

Consider this: a wound that closes in 7 to 14 days generally has a lower risk of excessive scarring than a wound that takes weeks to seal.

Sun exposure and discoloration

UV exposure does not just “tan” a healing scar. It can trigger pigment changes that make the scar look darker or more uneven for months. Even if you are focused on flattening, protecting against UV is a major part of reducing visible contrast between scar tissue and surrounding skin.

Skin tone and individual biology

People with more melanin may be more prone to post-inflammatory hyperpigmentation (darkening) after inflammation. Some people also have a stronger fibroblast response, meaning their skin produces collagen more aggressively during remodeling.

What most patients overlook: symptoms are data

Itching, tenderness, and “tight” sensations can be normal during remodeling. But worsening pain, increasing warmth, new drainage, or rapidly expanding redness is different. Those changes can signal irritation, allergy, or infection and should be reviewed by your clinician.

For help setting expectations about how long scar changes can take, read how long scars take to fade and what influences the timeline.

Treatment Overview: Hypertrophic Scar Treatment Options and How They Work

Hypertrophic scars can improve. The most effective plans usually combine consistent at-home care with targeted in-office options when needed.

First-line at-home care: silicone for raised scars

Silicone is widely used in hypertrophic scars treatment because it supports a healthier scar environment. When silicone sits on the scar consistently, it helps regulate hydration and may influence signals that drive excess collagen production.

Now, when it comes to choosing a silicone option, practical adherence matters. A product you will apply daily for months is more likely to help than one that sits unused in a drawer.

BIOCORNEUM® SiliShield® combines professional grade silicone with SPF 30 in one easy application. It is the #1 surgeon-recommended scar, bruise, and recovery care brand, trusted by plastic surgeons and dermatologists nationwide.

Why sun protection belongs in hypertrophic scar treatment

Redness and discoloration are often what make a hypertrophic scar feel “louder” than it is. Sun exposure can prolong visible redness and trigger lingering pigment changes, especially on the face, chest, and arms.

This is why BIOCORNEUM developed patented SiliShield® technology. The crosslinked silicone creates a flexible, breathable barrier that hydrates scar tissue while protecting against UV damage that can darken healing scars.

Massage and pressure: helpful for some scars

Once your surgeon or dermatologist confirms the wound is fully closed, gentle scar massage can improve pliability for some patients. Massage may help by mobilizing tissue, improving comfort, and supporting collagen alignment over time.

Pressure therapy (more common after burns) can also help flatten raised scars by reducing oxygen tension and modifying collagen deposition, but it is typically guided by specialists due to fit and wear-time requirements.

In-office options when a scar stays thick or symptomatic

If a hypertrophic scar remains very raised, itchy, or firm despite good home care, your clinician may discuss:

• Corticosteroid injections: Can reduce inflammation and collagen production, often improving thickness and symptoms over several sessions.
• Laser therapy: Vascular lasers may reduce redness, and fractional lasers may improve texture and pliability. Timing depends on skin type and scar maturity.
• Silicone plus procedures: Combining home silicone use with in-office treatment often improves consistency and results because collagen remodeling is a long process.

“Hypertrophic scar cream”: what to know before you buy

Many over-the-counter scar creams rely on moisturizers, onion extract, or botanicals. Moisturizing can support comfort and reduce dryness, but evidence for flattening raised scars is strongest for silicone-based products and for medical procedures when appropriate.

That does not mean a non-silicone cream is “bad.” It means you should match the product to your goal. If your goal is specifically to flatten raised scars and reduce redness, silicone and sun protection typically deserve a central role.

For a step-by-step framework on daily scar routines, review our Scar Care 101 guide to treatments and healing tips.

Prevention Strategies: Why Early Intervention Matters

Most patients start looking for hypertrophic scar treatment when a scar is already raised. Prevention starts earlier, often right when the incision is sealed and your clinician says topical care is safe.

Start when the wound is closed, not while it is open

Silicone and most topical scar products are intended for closed skin, not fresh open wounds. If you begin too early, you can trap moisture where you do not want it and irritate healing tissue. If you begin too late, the scar may have already built and organized excess collagen.

Support low-tension healing

If your incision crosses an area that moves constantly, ask your surgeon about strategies to reduce tension during early remodeling. This may include paper tape, silicone sheets, or other methods depending on the location and your skin sensitivity.

Protect from sun, even on “cloudy” days

UV exposure can worsen contrast and prolong discoloration. This is especially important in the first 6 to 12 months while pigment cells are reactive. Hats, clothing, and broad-spectrum sunscreen are helpful, but consistency is the challenge.

What dermatologists know is that combining scar care with daily SPF reduces the number of steps that patients have to remember. For those who prefer a single product approach for exposed scars, consider silicone scar gel options with broad-spectrum SPF 30 as part of your routine, if your provider agrees.

Watch for irritation early

Redness that is improving overall is common. Redness that spreads, becomes hot, increasingly painful, or starts draining should be assessed. Also consider contact dermatitis, which can happen with adhesives, fragrances, or certain topical ingredients.

Think in months, not days

Scar remodeling is slow by design. Many patients feel discouraged at week two or week four, which is often still early in the process. Consistent care for 8 to 12 weeks is a more realistic minimum window to judge progress, and some scars require longer.

Expert Tips: Professional Guidance for Flattening Raised Scars

When you are trying to figure out how to flatten raised scars, your daily habits matter more than a single “perfect” product.

A practical daily routine you can actually keep up with

• Confirm the scar is closed: Start topical scar care only when your surgeon or dermatologist confirms the skin surface is sealed.
• Use a thin layer: More product is not always better. A thin, even application improves comfort and wear.
• Prioritize contact time: Silicone works best when it stays on the scar consistently.
• Protect from UV: Use clothing and sunscreen, especially for scars on the face, chest, arms, and hands.
• Reassess at 8 to 12 weeks: Look for changes in softness, itch, redness, and thickness rather than expecting “instant fading.”

When to ask for help sooner

Consider checking in with your clinician if your scar is rapidly thickening, very painful, limiting motion, or significantly itchy despite regular care. Early office-based treatment can sometimes prevent a raised scar from becoming more established.

A note on confidence and visibility

Many patients feel fine until the scar becomes visible in a mirror or in photos, especially with chest or breast surgery scars. That reaction is normal. Your goal is not perfection, it is progress: a flatter scar, less redness, less discomfort, and a scar that becomes less attention-grabbing over time.

How to Apply Silicone Scar Gel and Get the Full Benefit

One of the most common reasons patients feel a scar product “did not work” is not the ingredient, it is the routine. Silicone is a time-on-skin therapy. It works best when it forms a consistent, low-irritation layer over a healed scar for weeks to months.

Step-by-step: a simple, repeatable routine

• Start only on fully closed skin: The surface should be sealed, with no open areas or active drainage. If you are not sure, ask your surgeon or dermatologist.
• Clean and dry first: Use mild cleanser and water if needed, then pat dry. Silicone adheres better to clean, dry skin.
• Apply a thin, even film: A small amount goes a long way. The goal is coverage, not a thick layer that never dries.
• Let it dry completely: Dry-down matters for comfort and for layering clothing, makeup, or sunscreen on top.
• Be consistent: Most evidence-based scar protocols evaluate outcomes over at least 8 to 12 weeks, and often longer for thicker scars.

How long should you keep going?

Scar remodeling is slow. Many patients judge results too early, before collagen has had time to reorganize. A reasonable first checkpoint is 8 to 12 weeks of consistent use, but improvements in thickness and redness can continue for many months. This aligns with clinical scar timelines, where meaningful maturation commonly continues for 6 to 18 months and sometimes longer.

Makeup, clothing, and daily life

Patients often ask whether they can wear makeup or put clothing over silicone gel. In most cases, once a silicone gel film is dry, it can be covered. This matters for adherence because it keeps scar care from turning into a multi-step project that you abandon after two weeks.

What if you get irritation?

Silicone is generally well tolerated, but any topical can irritate if you are applying too much, applying to skin that is not fully sealed, or layering it over other potentially irritating products. If you develop a new rash, worsening itch, burning, or spreading redness, stop the product and contact your clinician. Irritation is treatable, but ignoring it can prolong inflammation, which is the opposite of what you want for a hypertrophic scar.

Silicone Gel vs Silicone Sheets: Which Is Better for Raised Scars?

Both silicone gel and silicone sheets are widely used in hypertrophic scar treatment. If you have ever stood in a pharmacy aisle staring at options, you already know the real question is not “Which is best in theory?” It is “Which will I actually use consistently?”

How they are similar

Both formats aim to create a semi-occlusive barrier. That barrier helps regulate hydration in the outer skin layer and supports a calmer scar environment, which can help reduce symptoms like itch and tightness and may improve thickness and color over time. Systematic reviews have found silicone-based therapies can be helpful for prevention and management of hypertrophic scars, although study quality varies and results depend heavily on consistent use.

When silicone gel is often the practical choice

• Irregular or visible areas: Face, neck, jawline, clavicle, and any scar with curves.
• High-movement zones: Areas where sheets may peel or shift with activity.
• Patients who want discretion: Gel dries clear and is often easier to integrate under makeup or daily SPF.
• Combination routines: Many patients use gel during the day and reserve sheets for nighttime if their skin tolerates it.

When silicone sheets can be helpful

• Larger, flatter surfaces: Linear scars on the abdomen or back where a sheet can lay smoothly.
• Patients who prefer “set it and forget it” wear time: Some people do better with a longer-wear approach, as long as the sheet stays in place and does not irritate the skin.
• Pressure plus silicone: In certain settings (especially burn-related scars), silicone may be paired with pressure therapy, typically under specialist guidance.

A clinician-style way to decide

If your scar is raised and you can keep a sheet on comfortably without friction, it can be a good option. If the sheet is constantly peeling, wrinkling, or irritating the skin, a silicone gel routine you can actually maintain is usually the better plan. The best treatment is the one that is safe for your skin and consistent over time.

Special Situations: Scars in High-Movement Areas, Darker Skin Tones, and Sensitive Skin

Hypertrophic scars do not behave the same everywhere on the body, and they do not look the same on every skin tone. A plan that feels “standard” for one patient may need small but meaningful adjustments for another.

High-movement areas (joints, shoulders, chest, and abdomen)

Scars that cross joints or sit in areas that stretch all day can thicken because the wound experiences ongoing mechanical tension. This is well-described in surgical scar management literature, where reducing tension is one of the most important modifiable factors for improving scar quality.

Practical options your clinician may recommend include paper tape, silicone sheets, or supportive garments in early healing, along with consistent silicone use once the skin is closed. If a scar is near a joint and begins to feel tight, early evaluation matters because persistent tightness can contribute to functional limitation.

Darker skin tones and pigment changes

Patients with more melanin can be more prone to post-inflammatory hyperpigmentation after irritation or inflammation. That can make a scar appear darker even if the scar thickness is improving.

This is where sun protection becomes more than a cosmetic step. UV exposure can intensify pigment changes and prolong uneven color. A daily scar plan that includes silicone plus broad-spectrum SPF can help reduce the risk that the scar stays darker than surrounding skin. For persistent discoloration, dermatologists sometimes use targeted treatments, but those decisions depend on skin type, scar maturity, and medical history.

Sensitive skin and contact dermatitis

Some patients are prone to contact dermatitis (a skin reaction to an ingredient or adhesive). This is common with tapes and some sheet adhesives, and it can also occur with fragranced products. If you tend to react to bandages, tell your surgeon early so they can recommend lower-irritation options.

Any new itchy rash around a scar should be treated as a signal, not something to “push through.” Ongoing inflammation can keep a scar red and symptomatic longer than it needs to be.

When Home Care Is Not Enough: Signs You May Need In-Office Treatment

Home care is foundational, but some hypertrophic scars need more support. This is not a failure. It is simply biology plus location plus time.

Signs it is time to ask about procedures

• The scar is getting thicker after the first few months instead of gradually softening.
• Itch, pain, or tenderness is persistent and affecting sleep, clothing choices, or daily activity.
• The scar limits movement or feels like it is pulling, especially near a joint.
• Redness remains intense long after the early healing stage, particularly if the scar looks very vascular.

What dermatology offices often consider

Common in-office treatments include intralesional corticosteroid injections (often spaced several weeks apart) and laser therapy, which can target either redness (vascular lasers) or texture and stiffness (fractional devices). Some clinicians also use combination approaches for more resistant scars. Decisions depend on scar age, location, symptoms, and skin tone.

What to bring to your appointment

If you are seeing your clinician for a hypertrophic scar, it helps to bring: the date of surgery or injury, a photo of the scar from a few weeks earlier if you have one, and a list of what you have already used (including how often). That context makes it easier to choose the next step without unnecessary trial and error.

Frequently Asked Questions

What is the difference between a hypertrophic scar and a keloid?

A hypertrophic scar is raised and often red, but it stays within the borders of the original wound. A keloid grows beyond the wound edges into surrounding skin and can continue expanding over time. Both involve excess collagen, but keloids are more strongly tied to genetic risk and recurrence. If your scar extends past the incision line or keeps enlarging months later, it is worth asking a dermatologist for a precise diagnosis because treatment plans can differ.

When should I start hypertrophic scar treatment after surgery?

In most cases, you start scar treatment once the skin surface is fully closed and your surgeon confirms it is safe. Starting too early can irritate tissue or trap moisture in a way that slows healing. Starting too late can miss the window when collagen organization is most responsive. Many patients begin silicone-based care during early remodeling, then continue consistently for several months as the scar matures.

How long does it take to flatten a hypertrophic scar?

Flattening is gradual because it depends on collagen remodeling, not just surface changes. Many patients notice early improvements in itch and comfort first, then texture and thickness, and finally color. A reasonable first checkpoint is 8 to 12 weeks of consistent care, but meaningful changes can continue for 6 to 12 months and sometimes longer. For more detailed timelines, see our guide on how long scars take to fade.

What is the best hypertrophic scar cream?

“Best” depends on your scar and your goal. If you are specifically targeting a raised scar, professional grade silicone has the strongest track record for improving thickness and symptoms when used consistently on closed skin. Many standard creams mainly moisturize, which can help comfort but may not reliably flatten raised scars. If the scar is exposed to sunlight, choosing a product that also supports sun protection can help reduce lingering discoloration.

Does silicone gel really work for hypertrophic scars?

Silicone is commonly recommended by surgeons and dermatologists because it helps create an optimal environment for scar maturation. It supports hydration and barrier function and can reduce symptoms like itch and tightness, which often accompany hypertrophic scars. Results vary by individual, location, and how consistently it is applied. Silicone is not an overnight fix, but it is a foundational option that is often used alone for mild scars or combined with procedures for more persistent scars.

Why does my scar look red, and how do I reduce redness?

Redness often reflects increased blood flow and active remodeling in newer scars. Over time, many scars fade as blood vessels settle down. You can support this process by minimizing friction, following your surgeon’s wound care plan, and protecting the area from UV exposure, which can prolong visible color changes. If redness remains intense or the scar is very symptomatic, vascular laser treatment may be an option to discuss with a dermatologist.

Can I massage a hypertrophic scar to flatten it?

Scar massage can help some patients, but timing is important. Massage should only begin after the wound is fully closed and your clinician confirms it is appropriate. Gentle, consistent massage can improve pliability and comfort, and it may help collagen align more evenly. If massage causes increased pain, skin breakdown, or persistent irritation, stop and ask your provider for guidance. Massage works best as part of a broader plan, not as a stand-alone fix.

What treatments do dermatologists use for stubborn raised scars?

For scars that stay thick, itchy, or firm, dermatologists may recommend steroid injections, laser therapy, or a combination approach. Steroid injections can reduce collagen overproduction and calm symptoms over multiple visits. Laser treatments may target redness or improve texture depending on the device used. The best choice depends on scar age, location, skin type, and your medical history. Home care remains important because scar remodeling continues between visits.

Will a hypertrophic scar go away completely?

Most scars do not disappear completely, even with excellent treatment. The realistic goal is improvement: flatter texture, less redness, less itch or tenderness, and a closer match to surrounding skin. Many hypertrophic scars soften and flatten over time, especially when managed early and consistently. If you want a realistic overview of what “scar removal” means medically, read our guide to scar removal expectations and options.

When should I worry about a scar changing in a concerning way?

Contact your healthcare provider if you notice rapidly spreading redness, increasing warmth, new drainage, fever, or worsening pain. Also ask for evaluation if a scar develops a persistent sore, bleeds easily, or changes in an unusual way long after healing. While it is uncommon, skin cancers can arise in chronic wounds or scars. If you have concerns, see what to know about skin cancer in a scar and schedule a clinical exam.

Can I use silicone gel and silicone sheets together?

Some patients use a combination approach, such as silicone gel during the day and silicone sheets at night, to increase total contact time. The best plan is the one you can follow consistently without irritating your skin. If you develop a rash or increased redness from adhesives or occlusion, stop and ask your clinician for guidance.

Can I put sunscreen on top of silicone gel?

In many routines, silicone gel is applied as a thin film and allowed to dry completely, then sunscreen and makeup can be layered if needed. If you are using a silicone gel that already includes SPF, you may still choose additional sun protection depending on your exposure, but it is best to follow product directions and your clinician’s guidance.

What if my scar is raised but also turning brown?

A raised scar suggests collagen overproduction, while brown discoloration is often related to pigment changes, especially after inflammation or UV exposure. Addressing both usually means consistent silicone use on closed skin plus strict sun protection. If discoloration persists or worsens, a dermatologist can evaluate whether targeted treatments for pigment are appropriate for your skin type and scar stage.