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.

Skin Health

What Do Types of Skin Cancer Look Like?

The three most common types - basal cell carcinoma, squamous cell carcinoma, and melanoma - tend to look different from one another, but all three are worth having checked by a professional rather than diagnosed from a photo online.

Quick answerBasal cell carcinoma often looks like a pearly or waxy bump, sometimes with visible blood vessels.

Medically reviewed by Dermatology reviewer · Updated Jul 9, 2026 · 5 min read

Illustration of a dermatologist examining skin
Common TypesBCC, SCC, melanoma
Most CommonBasal cell carcinoma
Most SeriousMelanoma
Key CheckABCDE rule for moles
EvidenceStrong

Key answer

Useful for awareness, not diagnosis

Visual patterns can help you know when to get checked, but only a dermatologist can properly diagnose a suspicious spot.

Evidence
Strong - Useful for awareness, not diagnosis
Best for
Recognizing when to seek a professional evaluation
Limitation
Self-diagnosing or ruling out skin cancer

See what the evidence shows

Short version

Story in brief

Basal cell carcinoma, the most common type, often appears as a small, pearly or waxy bump, sometimes with visible small blood vessels, and tends to grow slowly.

Squamous cell carcinoma often presents as a firm, red, scaly patch, a sore that doesn't heal, or a wart-like growth, and can appear on sun-exposed areas like the face, ears, and hands.

Melanoma, though less common, is the most serious type and often develops from a mole that changes in size, shape, or color, which is why the ABCDE rule (asymmetry, border, color, diameter, evolving) is commonly taught as a screening guide.

Mental model

Visual explanation

Evidence

What the evidence shows

No description here is a substitute for a professional skin check. These are general patterns meant to help you recognize when something is worth having examined, not a way to rule skin cancer in or out on your own.

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

    Most commonUse caution
    Fit signal
    Limited evidence

    Basal cell carcinoma

  • If your goal is

    Most seriousDepends
    Fit signal
    Possible fit

    Melanoma

  • If your goal is

    Key screening toolUse caution
    Fit signal
    Limited evidence

    ABCDE rule

  • If your goal is

    EvidenceUsually relevant
    Fit signal
    Often useful

    Strong

Practical use

How to use it

  1. Check your skin regularly

    Look for new spots or changes to existing moles, ideally with a full-body check every few months.

  2. Apply the ABCDE rule to moles

    Watch for asymmetry, irregular borders, uneven color, larger diameter, or evolving appearance.

  3. See a dermatologist for anything concerning

    A professional skin exam is the only reliable way to evaluate a suspicious spot.

Safety

Side effects and cautions

  • Trying to self-diagnose from photos or descriptions alone

    Use general knowledge to know when something warrants a check, not to rule skin cancer in or out yourself.

  • Waiting to see if a suspicious spot changes before seeking care

    Early evaluation generally leads to better outcomes, especially for melanoma.

  • Assuming only sun-exposed areas need checking

    While common on sun-exposed skin, skin cancer can occur on any part of the body, including areas rarely exposed to sun.

  • New or changing mole

    See a dermatologist for evaluation.

  • Non-healing sore

    Have it examined, especially if present for several weeks.

  • Mole matching ABCDE signs

    Seek prompt professional evaluation.

Fit

Who should be careful

  • Self-diagnosing or ruling out skin cancer

Helpful context

What else is worth knowing

Research Highlights

What the evidence suggests

strong

Early detection is strongly associated with better outcomes across skin cancer types, particularly melanoma.

Regular self-checks and professional skin exams support earlier detection.

Worth noting

Small details that can change the answer

  • BCC. Basal cell carcinoma is the most common type of skin cancer and typically grows slowly.
  • SCC. Squamous cell carcinoma often appears on sun-exposed skin and can sometimes grow more quickly than basal cell carcinoma.
  • Melanoma. Melanoma is less common but more likely to spread if not caught early, making early detection especially important.
  • ABCDE Rule. The ABCDE rule (asymmetry, border, color, diameter, evolving) is a widely used screening guide for evaluating moles.

Basal cell carcinoma often looks like a pearly or waxy bump.

Squamous cell carcinoma often appears as a firm, red, scaly patch or non-healing sore.

Melanoma often develops from a changing mole, assessed using the ABCDE rule.

Skin cancer can occur on any part of the body, not only sun-exposed areas.

Any new or changing spot is worth having evaluated by a dermatologist.

Basal cell carcinoma - common signs

  • A pearly or waxy-looking bump
  • Visible small blood vessels on or near the bump
  • A sore that bleeds, heals, and returns
  • A flat, scar-like lesion in some cases

Squamous cell carcinoma - common signs

  • A firm, red, scaly patch
  • A sore that doesn't heal or keeps returning
  • A wart-like or crusted growth
  • Often located on sun-exposed areas like the face, ears, or hands

Melanoma - common signs (the ABCDE rule)

  • Asymmetry - one half doesn't match the other
  • Border - irregular, ragged, or blurred edges
  • Color - uneven color or multiple shades within one spot
  • Diameter - larger than about 6mm, roughly a pencil eraser
  • Evolving - any change in size, shape, or color over time

When to see a dermatologist

  • Any new or changing mole or spot
  • A sore that does not heal within a few weeks
  • A spot that itches, bleeds, or becomes tender
  • Any lesion matching the ABCDE warning signs

Questions

Frequently asked questions

What does basal cell carcinoma look like?

It often appears as a pearly or waxy bump, sometimes with visible small blood vessels, and typically grows slowly.

How can I tell if a mole might be melanoma?

The ABCDE rule, checking asymmetry, border irregularity, color variation, diameter, and evolving change, is a commonly used screening guide, though only a dermatologist can properly evaluate a mole.

Is skin cancer only found on sun-exposed skin?

Most commonly, yes, but it can occur on any part of the body, including areas rarely exposed to sun.

How often should I check my skin for cancer?

Many dermatologists recommend a self-check roughly every few months, along with periodic professional skin exams.