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.

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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.

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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.

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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 & Skin Sensitivity

Can Sensitive Skin Use Glycolic Acid?

Glycolic acid is the most powerful and most popular alpha hydroxy acid, but it's also the most irritating. For sensitive skin, it's a high-risk, high-reward ingredient that requires careful handling.

Glycolic acid is the king of alpha hydroxy acids - small, powerful, and effective.

That small molecule size is both its strength and its weakness for sensitive skin, as it penetrates deeply and can cause significant irritation.

So can sensitive skin use glycolic acid?

If other acids are a polite knock on the door, glycolic acid is a battering ram - effective, but not always gentle.

Quick answerYes, sensitive skin can use glycolic acid, but with significant caution.

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

Gentle glycolic acid product beside exfoliated, glowing sensitive skin
Ingredient TypeAHA (Alpha Hydroxy Acid)
Key PropertyExfoliates and brightens
Best ForNormal, oily, aging skin
Safe For Sensitive?With caution, low concentrations
EvidenceStrong

Key answer

Yes

Glycolic acid can be used with caution, but gentler alternatives are usually better.

Evidence
Strong - With caution, not ideal
Best for
Those with mild sensitivity who want strong exfoliation
Limitation
Very reactive skin, rosacea, or eczema

See what the evidence shows

Short version

Story in brief

Glycolic acid is an alpha hydroxy acid (AHA) derived from sugar cane. It has the smallest molecular size of all AHAs, which allows it to penetrate the skin deeply and effectively. This makes it excellent for exfoliation, brightening, and anti-aging.

However, that same small size is why it's irritating. The deeper it penetrates, the more it can cause inflammation, especially in sensitive skin. While it can be used with careful introduction, many dermatologists recommend gentler AHAs like lactic acid (larger molecule) or mandelic acid (even larger) for sensitive skin.

If you choose to use glycolic acid on sensitive skin, start with a low concentration (5% or less), use it infrequently (once a week), and always follow with a soothing moisturizer. A buffered or slow-release formulation can also help reduce irritation.

Mental model

Visual explanation

Evidence

What the evidence shows

Glycolic acid's small molecule size is the reason it's so effective - and also the reason it's so irritating. For sensitive skin, this makes it a high-risk ingredient that requires careful introduction.

  • Your skin is only mildly sensitive

    You may be able to tolerate a low concentration with slow introduction.

  • You have very reactive skin or rosacea

    Avoid glycolic acid; choose gentler alternatives like PHA or lactic acid.

  • You want gentle, effective exfoliation

    Choose mandelic acid or PHA, which are much gentler for sensitive skin.

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

    TypeUse caution
    Fit signal
    Limited evidence

    AHA (Alpha Hydroxy Acid)

  • If your goal is

    Best strength for sensitiveDepends
    Fit signal
    Possible fit

    5% or less

  • If your goal is

    Start frequencyDepends
    Fit signal
    Possible fit

    Once weekly

  • If your goal is

    AlternativesUsually relevant
    Fit signal
    Often useful

    Lactic acid, mandelic acid, PHAs

Expected results

Results and timeframe

Start with a low concentration (5% or less) and infrequent use (once a week).

Practical use

How to use it

  1. Start with a low concentration (5% or less)

    Choose a gentle glycolic acid product formulated for sensitive skin.

  2. Use it once a week initially

    Apply in the evening, after cleansing and before moisturizing.

  3. Always use sunscreen

    Glycolic acid increases sun sensitivity; SPF 30+ every morning is essential.

Safety

Side effects and cautions

  • Starting with a high concentration (10%+)

    Start with 5% or less for sensitive skin.

  • Using it daily or even several times a week

    Start with once a week and increase gradually.

  • Not following with a moisturizer

    Glycolic acid can dry the skin; follow with a rich moisturizer.

Fit

Who should be careful

  • Very reactive skin, rosacea, or eczema

Worth noting

Small details that can change the answer

  • Molecular Weight. Glycolic acid has a molecular weight of 76 daltons, making it the smallest AHA.
  • Irritation Risk. Glycolic acid is the most irritating AHA due to its small size and deep penetration.
  • Concentration. OTC glycolic acid ranges from 5-20%; prescription strengths go higher.
  • Alternatives. Lactic acid (90 daltons) and mandelic acid (152 daltons) are gentler alternatives for sensitive skin.

Glycolic acid can be used on sensitive skin, but with significant caution.

Consider gentler AHAs like lactic acid or mandelic acid instead.

Always follow with a moisturizer and use sunscreen daily.

If you experience significant stinging or redness, discontinue use.

Definition

What is glycolic acid?

Glycolic acid is an alpha hydroxy acid (AHA) derived from sugar cane. It's used to exfoliate the skin, reduce fine lines, and improve texture. It has the smallest molecular size of all AHAs, which gives it excellent penetration but also higher irritation potential.

  • Derived from sugar cane
  • Smallest molecular size of AHAs
  • Exfoliates, brightens, and reduces fine lines
  • Most irritating AHA for sensitive skin

Science

Why glycolic acid irritates sensitive skin

Glycolic acid irritates sensitive skin because its small molecular size allows it to penetrate deeply into the skin. This can trigger an inflammatory response, especially in skin with a compromised barrier. It also disrupts the acid mantle temporarily, which can cause stinging and burning in sensitive individuals.

AHA
Alpha hydroxy acid - a group of acids that exfoliate the skin by breaking down the bonds between dead skin cells.
Molecular Weight
The size of a molecule, which affects how deeply it can penetrate the skin. Smaller molecules penetrate more deeply.

Benefits

What glycolic acid can do for sensitive skin (with caution)

With careful use, glycolic acid can offer benefits even for sensitive skin.

  • Exfoliates dead skin cells, improving texture
  • Reduces the appearance of fine lines and wrinkles
  • Brightens skin and fades pigmentation
  • Can improve skin radiance and glow

Risks

Risks for sensitive skin

The risks of glycolic acid for sensitive skin are significant and should be considered carefully.

  • Stinging, burning, and redness are common
  • Barrier damage can occur with overuse
  • Can worsen conditions like rosacea or eczema
  • Requires careful introduction and low concentrations

Questions

Frequently asked questions

Is glycolic acid stronger than lactic acid?

Yes, glycolic acid has a smaller molecular size and penetrates more deeply, making it stronger and more irritating.

Can I use glycolic acid with retinol on sensitive skin?

It's not recommended, as the combination can be too irritating for sensitive skin.

What's the best alternative to glycolic acid for sensitive skin?

Lactic acid and mandelic acid are gentler AHAs, and PHAs (polyhydroxy acids) are even gentler.

How long does it take to see results from glycolic acid?

Results typically take 4-8 weeks of consistent use.