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.

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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.

Conditions & Safety

Why Does Melanin Increase During Pregnancy?

Pregnancy changes the skin in ways that range from the subtle to the unmistakable. One of the more visible changes is an increase in pigmentation, which can appear as dark patches on the face, a dark line down the abdomen, or darker freckles and moles.

Pregnancy is associated with a long list of physical changes, and skin pigmentation is one of the more visible.

The dark line that appears down the abdomen, the patches on the face, and the darkening of freckles and moles all share a common cause: pregnancy hormones stimulating melanin production [citation:10].

So why does melanin increase during pregnancy?

It is less like a malfunction and more like a dial being turned up: the pigment-producing cells are doing what they normally do, just more of it.

Quick answerMelanin increases during pregnancy primarily due to hormonal changes.

Medically reviewed by Dermatology reviewer · Updated Sep 11, 2026 · 4 min read

Pregnant woman with dark line on abdomen
CauseHormones
Key HormoneEstrogen
Common SignsMelasma, linea nigra
Typical TimingAny trimester
EvidenceGood

Key answer

Hormonal and common

Pregnancy hormones, especially estrogen, stimulate melanin production, causing common pigmentation changes [citation:10].

Evidence
Moderate - Hormonal and common
Best for
Understanding pregnancy-related pigmentation
Limitation
Anyone with concerns about persistent pigmentation

See what the evidence shows

Short version

Story in brief

Melanin is the pigment that gives skin, hair, and eyes their color. It is produced by cells called melanocytes, which are found in the skin. During pregnancy, hormonal changes affect how active these cells are.

Experts believe that high estrogen levels during pregnancy increase melanin production by melanocytes [citation:10]. This extra pigment can cause several common skin changes, including linea nigra, darkening around the nipples and areolas, darker freckles or moles, and melasma, also called the mask of pregnancy [citation:10].

These changes are usually temporary and fade after pregnancy, though they can persist in some cases. Sun protection is important during pregnancy because UV exposure can worsen pigmentation.

Mental model

Visual explanation

Evidence

What the evidence shows

Pregnancy pigmentation is driven by hormones stimulating melanin production, not by sun exposure alone, though sun exposure can worsen it [citation:10].

  • New pigmentation during pregnancy?

    Use daily sun protectionPrevents worsening [citation:10].

  • Concerned about skin changes?

    Discuss with your healthcare provider

  • Pigmentation persists after pregnancy?

    Consult a dermatologist about treatment options

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

    CauseUse caution
    Fit signal
    Limited evidence

    Hormones

  • If your goal is

    Key hormoneUse caution
    Fit signal
    Limited evidence

    Estrogen

  • If your goal is

    Common signsUse caution
    Fit signal
    Limited evidence

    Melasma, linea nigra

  • If your goal is

    OutlookUsually relevant
    Fit signal
    Often useful

    Usually temporary

Practical use

How to use it

  1. Protect from sun

    Use broad-spectrum sunscreen daily [citation:10].

  2. Be patient

    Pigmentation often fades after pregnancy.

  3. Consult your provider

    Discuss any concerns about skin changes.

Safety

Side effects and cautions

  • Assuming pigmentation is permanent

    It usually fades after pregnancy, though it can persist in some cases.

  • Skipping sun protection

    UV exposure can worsen pregnancy-related pigmentation [citation:10].

  • Using retinoids or hydroquinone

    These are generally avoided during pregnancy; consult your provider.

Fit

Who should be careful

  • Anyone with concerns about persistent pigmentation

Worth noting

Small details that can change the answer

  • Cause. Pregnancy hormones, especially estrogen, stimulate melanin production [citation:10].
  • Common Signs. Linea nigra, melasma, darkening of areolas [citation:10].
  • Mechanism. Melanocytes produce more pigment [citation:10].
  • Outlook. Usually temporary, fades after pregnancy.

Melanin increases during pregnancy due to hormonal changes [citation:10].

Estrogen is believed to stimulate melanocytes [citation:10].

Common signs include linea nigra, melasma, and darkened areolas [citation:10].

Sun protection is important to prevent worsening.

Pigmentation usually fades after pregnancy.

Science

How hormones affect melanin

High estrogen levels during pregnancy are believed to increase melanin production by melanocytes, the pigment-producing cells in the skin [citation:10]. This leads to increased pigmentation in various areas.

Melanocytes
Cells in the skin that produce melanin, the pigment responsible for skin color [citation:10].
Melasma
Dark patches on the face, also called the mask of pregnancy [citation:10].

Explanation

Common pigmentation changes in pregnancy

Increased melanin production can cause several visible changes.

Avoid

What to avoid during pregnancy

Unprotected sun exposurehigh

UV can worsen pigmentation [citation:10].

Retinoidshigh

Generally avoided during pregnancy; consult your provider.

Hydroquinonehigh

Not recommended during pregnancy; consult your provider.

Clinical Guidance

When to seek medical care

  • If you are concerned about sudden or extensive pigmentation changes.
  • If you have questions about safe skincare during pregnancy.
  • If pigmentation persists after pregnancy and you want treatment options.

Questions

Frequently asked questions

Why does pregnancy cause dark patches?

Hormones, especially estrogen, increase melanin production [citation:10].

What is linea nigra?

A dark line down the middle of the abdomen caused by increased pigmentation during pregnancy [citation:10].

Does pregnancy pigmentation go away?

It usually fades after pregnancy, though it can persist in some cases.

What can I use for pigmentation during pregnancy?

Sun protection is the main safe approach; consult your provider about other options.