SkincareSafety Guide

Skin

Understand your skin type, tone, and what your skin is doing.

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Start here

Skin typesThe main skin types and how they differ.Find your skin typeA practical identification guide.What different skin types look likeVisual differences between common skin types.

Common skin questions

Oily skinWhat oily skin means and how to read it.Skin type changesHow skin type can shift over time.Skin type and ageHow visible aging differs by skin type.
Not sure where to start?Use the skin-type guide before choosing routines or ingredients.

Concerns

Start from a skin problem or visible change.

View concern guides

Oil and acne

Why oily skin happensThe main drivers behind excess oil.Oily skin and acneHow oil can contribute to breakouts.Can oily skin cause acne?A direct answer to the oil-acne link.

Changes and warning signs

Stress and oily skinHow stress may affect oiliness.Dehydration and oilinessWhy skin can feel oily and dehydrated.Skin cancer signsVisual signs that need professional attention.
Looking for a solution?Start with what oily skin actually needs before adding stronger products.

Ingredients

Understand what ingredients do and whether they fit your skin.

View ingredient questions

Explore ingredients

NiacinamideA practical ingredient overview.Vitamin C serumWho can use vitamin C and when to be careful.RetinolHow retinol fits different skin types.

Use safely

Salicylic acidWhere this acne-focused ingredient fits.Niacinamide for all skin typesSuitability across skin types.Ingredient comparisonsUse comparisons to avoid mismatched decisions.
Can my skin use this?Browse compatibility questions before adding a new active.

Routines

Turn skin information into daily decisions.

View routine questions

Daily basics

Does every skin type need moisturizer?A basic routine decision.Does every skin type need sunscreen?Where SPF fits in daily care.What oily skin needsA simple care direction for oily skin.

Adjust over time

Skin changes with ageWhen your routine may need to change.Seasonal skin changesHow weather affects skin behavior.Korean skincare approachWhat is useful beneath the trend.
Starting from scratch?Begin with moisturizer, sunscreen, and one skin-specific need.

Products

A small selection of skincare products recommended by OuterDerm for simple, effective everyday routines.

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Recommended picks

Daily SunscreenDaily UV protection that has to be wearable enough to stick with.Azelaic AcidA focused 10% azelaic acid when uneven tone or blemish marks are the concern.Gentle CleanserComfortable cleansing when tight or squeaky skin is a warning sign.
Not sure where to start?Browse three carefully selected essentials, then ask on WhatsApp before you order.

Learn

Go deeper into skin science, myths, evidence, and safety.

View learning guides

Hazardous ingredients

Safety hubStart with mercury, steroids, PPD and other hazardous substances.Ingredient safety indexBrowse Phase 1 and Phase 2 hazardous ingredients.Mercury in whitening creamsLabel names, Punjab alerts, and what to do now.

Product literacy

Product literacy hubHow to read labels, claims, and INCI lists before you buy.How to read an ingredient labelINCI order, Parfum, and missing-list red flags.Fragrance-free vs unscentedHow to verify a fragrance-free claim on the ingredient list.How to choose sunscreenBroad spectrum, wearability, and a readable pack — not a fairness claim.

Skin science

Skin color geneticsHow inherited traits shape skin color.Skin color typesHow skin tone is commonly grouped.Are skin types genetic?What genetics can and cannot explain.

Evidence and myths

Can all skin types tan?Tanning, risk, and skin type.Is oily skin good or bad?A balanced view of oily skin.Why Korean skin looks flawlessTrend claims translated into practical basics.
Want the evidence layer?Use why-guides when you want causes, mechanisms, and context.

Ingredients & Scar Recovery

Will Niacinamide Help With Acne Scars?

Acne scars come in two varieties: the kind where there's a physical indentation or texture change, and the kind where there's a dark mark. Niacinamide can help with one of these much better than the other.

Acne scars are a cruel double blow - you've dealt with the pimple, and now you're left with a mark that reminds you of it long after the breakout has healed.

Niacinamide is often recommended for scarring, but does it actually work, and what kind of scars can it help with?

Let's clarify what niacinamide can and cannot do for acne scars.

Niacinamide on acne scars is like a color corrector for your skin - it doesn't change the texture, but it reduces the visibility of the marks so they blend in more naturally.

Quick answerNiacinamide helps with pigmented acne scars (dark marks left after breakouts) by inhibiting melanin transfer and reducing inflammation.

Medically reviewed by Dermatology reviewer · Updated Jul 18, 2026 · 5 min read

Niacinamide serum beside skin with fading post-acne marks
IngredientNiacinamide (Vitamin B3)
Effect on ScarsHelps with pigmented marks, not texture
Key MechanismMelanin inhibition, anti-inflammatory
Time to Results4-12 weeks
Evidence LevelGood

Key answer

Yes for pigmented scars, no for atrophic

Niacinamide helps fade pigmented acne scars through melanin inhibition, but it doesn't affect atrophic (textural) scars.

Evidence
Moderate - Yes for pigmented scars, no for atrophic
Timeframe
4-12 weeks
Best for
Post-inflammatory hyperpigmentation (dark marks)
Limitation
Atrophic (pitted or indented) scars

See what the evidence shows

Short version

Story in brief

There are two main types of acne scars: pigmented (dark or red marks left after a breakout) and atrophic (pitted or indented scars). These are caused by different processes and respond to different treatments.

Niacinamide works on pigmented scars through its melanin-inhibiting and anti-inflammatory effects. It prevents new pigment from forming in the area and calms any residual inflammation that could trigger new pigmentation.

It cannot, however, fix atrophic scars. Those are caused by a loss of collagen and require treatments like retinoids, microneedling, or lasers to improve. Niacinamide can support overall skin health during these treatments, but it won't fix the texture issue alone.

Mental model

Visual explanation

Evidence

What the evidence shows

The term "acne scar" is misleading - it covers two different things: pigmented marks (which niacinamide can help) and textural changes (which niacinamide cannot). Understanding which type you have is essential.

  • Are your scars dark or red marks (not indentations)?

    Niacinamide is ideal for fading pigmented post-acne marks.

  • Are your scars pitted or indented?

    Niacinamide won't fix these - consult a dermatologist.

  • Are you willing to be patient?

    Scar fading takes 4-12 weeks of consistent use.

  • Will you use sunscreen daily?

    Sunscreen is essential to prevent scars from darkening.

Use this section to decide

Does this advice apply to me?

Find the concern or goal closest to yours, then use the fit signal to decide how much weight to give this guide.
Strong fit means the advice is central to that goal.Depends means formula, tolerance, or context matters more.Use caution means do not treat it as the main answer.

  • If your goal is

    Pigmented ScarsUsually relevant
    Fit signal
    Often useful

    Helps fade them

  • If your goal is

    Atrophic ScarsDepends
    Fit signal
    Possible fit

    Doesn't help

  • If your goal is

    Key MechanismUse caution
    Fit signal
    Limited evidence

    Melanin inhibition

  • If your goal is

    Evidence LevelUsually relevant
    Fit signal
    Often useful

    Good

Research notes already in this guide

  • Studies show niacinamide reduces post-inflammatory hyperpigmentation.
  • Research demonstrates niacinamide's anti-inflammatory effects support scar healing.
  • Clinical trials show improvement in pigmented scars with consistent niacinamide use.
  • Dermatologists recommend niacinamide for post-inflammatory hyperpigmentation.

Explanation

How it works

  1. Inhibits melanin transfer

    Prevents new pigment from forming in the scarred area.

  2. Reduces inflammation

    Calms any residual inflammation that could trigger pigmentation.

  3. Supports barrier function

    Creates a healthy environment for healing.

  4. Gradual fading

    Over 4-12 weeks, pigmented scars become less visible.

Expected results

Results and timeframe

Time to results: 4-12 weeks

Results for pigmented scars take 4-12 weeks of consistent use.

Practical use

How to use it

  1. Identify your scar type

    Determine if you have pigmented marks (PIH) or atrophic scars.

  2. Use niacinamide for pigmented scars

    Apply daily for 4-12 weeks to fade dark marks.

  3. Consider other treatments for atrophic scars

    For indentations, consult a dermatologist about retinoids, microneedling, or lasers.

Safety

Side effects and cautions

  • Expecting niacinamide to fix pitted or indented scars

    It doesn't affect atrophic scars - those require different treatments.

  • Stopping use when scars start to fade

    Continued use prevents new pigmented scars from forming.

  • Using niacinamide without sunscreen

    UV exposure darkens pigmented scars, countering niacinamide's effects.

Fit

Who should be careful

  • Atrophic (pitted or indented) scars

Worth noting

Small details that can change the answer

  • PIH Mechanism. Post-inflammatory hyperpigmentation (PIH) is what niacinamide helps fade.
  • Atrophic Scars. Niacinamide doesn't affect indented or pitted scars.
  • Melanin Inhibition. Niacinamide blocks melanin transfer, fading pigmented marks.
  • Anti-Inflammatory. Niacinamide reduces inflammation that can worsen pigmentation.

Niacinamide helps with pigmented acne scars (dark marks) by inhibiting melanin transfer.

It doesn't help with atrophic scars (indentations or pitted scars).

Sunscreen is essential to prevent further darkening of scars.

For atrophic scars, niacinamide can support overall skin health but won't fix the texture.

Definition

Understanding the types of acne scars

Acne scars fall into two main categories: pigmented and atrophic. Pigmented scars (PIH) are dark marks left after inflammation; atrophic scars are indentations caused by collagen loss. Niacinamide helps with the first type but not the second.

  • Post-inflammatory hyperpigmentation (PIH): dark or red marks that fade over time
  • Atrophic scars: pitted or indented scars from collagen loss
  • Niacinamide: effective for PIH, not for atrophic scars

Benefits

What to expect for acne scars

When niacinamide works on acne scars, here's what you can expect.

  • Fading of dark marks left by breakouts over 4-12 weeks
  • Reduced redness in areas of previous inflammation
  • More even skin tone overall
  • Prevention of new pigmented scars from forming

Questions

Frequently asked questions

Can niacinamide remove old acne scars?

It can help fade old pigmented scars, but atrophic scars require different treatments.

How long does niacinamide take to fade acne scars?

Most people see improvement in 4-12 weeks of consistent use.

Is niacinamide or vitamin C better for acne scars?

They work differently and are often used together for pigmented scars.

Can niacinamide prevent acne scars from forming?

Yes - by reducing inflammation and promoting barrier health, it can help prevent PIH.

References

Sources

The notes below are drawn from the evidence already cited in this guide. They are not a complete bibliography.

  1. Studies show niacinamide reduces post-inflammatory hyperpigmentation.
  2. Research demonstrates niacinamide's anti-inflammatory effects support scar healing.
  3. Clinical trials show improvement in pigmented scars with consistent niacinamide use.
  4. Dermatologists recommend niacinamide for post-inflammatory hyperpigmentation.