Does skin cancer hurt or itch?

Usually not — and that's exactly why it's easy to ignore. Most people who find a suspicious spot or a dark streak under a nail feel completely fine. Skin cancers can sometimes itch, hurt, bleed, or crust, but the most reliable clue is visual: a spot that is new, changing, or different from everything around it. You don't need symptoms to justify getting a spot checked.

Can I tell which type of skin cancer I have from a photo online?

No, and neither can we or any app. The three main skin cancers can look remarkably alike in the early stages, and harmless spots can mimic all of them. Only a clinician can diagnose skin cancer, almost always by taking a small sample (a biopsy) and examining it under a microscope. This article is to help you recognize when to be seen — not to self-diagnose.

How common is skin cancer, really?

Very common — skin cancer is the most frequently diagnosed cancer overall, and basal cell carcinoma alone is the most common cancer in humans. The reassuring part is that the two most common types (basal and squamous cell) are highly curable when found early, and even melanoma — the most dangerous — has an excellent outlook when caught at its earliest stage. Early detection is the whole game.

Skin Cancer Warning Signs, Explained (What to Look For)

Skin cancer is the most commonly diagnosed cancer, and most cases are linked to ultraviolet (UV) exposure from the sun and tanning beds (StatPearls). The good news that runs through this whole topic: found early, skin cancer is very treatable. The purpose of this guide is simply to help you recognize the warning signs and know when to see a doctor.

One thing to be clear about up front: this is awareness, not diagnosis. The three main skin cancers can look alike early on, and plenty of harmless spots mimic them. Only a clinician can diagnose skin cancer — this article helps you decide when to book that visit.

The general rule (works for all types)

Before the specifics, the single most useful habit is watching for a spot that (AAD):

Differs from the others around it,
Changes over weeks or months,
Itches, or
Bleeds or won't heal.

Most people who find skin cancer feel perfectly well — you don't need pain or symptoms. A non-healing sore, a spot that heals and comes back, or a new dark streak under a nail all belong on this list too.

Basal cell carcinoma (BCC)

The most common skin cancer — and the most common cancer in people overall. BCC grows slowly and very rarely spreads, but left alone it can invade and damage nearby tissue, so it still needs treatment (StatPearls). It tends to appear on sun-exposed skin — face, ears, neck, scalp, shoulders.

Common looks:

A pearly or waxy bump, sometimes with tiny visible blood vessels.
A flat, flesh-colored or brown scar-like patch.
A sore that bleeds, scabs, heals, and returns in the same spot.

Squamous cell carcinoma (SCC)

The second most common skin cancer. It's usually very treatable when caught early, but SCC is more likely than BCC to grow into deeper tissue or spread if neglected, so timely diagnosis matters (StatPearls). It also favors sun-exposed areas, including the lips and the backs of the hands.

Common looks:

A firm, red bump or nodule.
A rough, scaly patch that may crust or bleed.
A sore or raised growth that won't heal.

SCC often develops from actinic keratoses — rough, precancerous sun-damage patches. We cover those separately in actinic keratosis, explained.

Melanoma (the most serious)

Melanoma is less common than BCC and SCC but far more dangerous, because it can spread to other parts of the body — it's responsible for most skin-cancer deaths (StatPearls). And here's the reason early detection is emphasized so heavily: for melanoma caught at its earliest stage, the five-year survival rate is around 97%, versus roughly 30% once it has spread to distant organs (StatPearls).

Melanoma most often shows up as a new dark spot or a changing mole. The tool to remember is the ABCDEs (AAD):

A — Asymmetry
B — Border (irregular or poorly defined)
C — Color (more than one)
D — Diameter (bigger than ~6 mm)
E — Evolving (changing, or new)

It can also appear where you'd least expect it — including the soles, palms, and under the nails. Our companion article, moles, explained, goes deeper on telling a normal mole from a worrying one.

Who's at higher risk

Anyone can get skin cancer, but risk is higher with (StatPearls): fair skin that burns easily, a history of sunburns or tanning-bed use, lots of moles or atypical moles, a personal or family history of skin cancer, and a weakened immune system. Higher risk isn't a diagnosis — it's a reason to be extra consistent with skin checks and sun protection.

Prevention and early detection

The two levers that matter most:

Reduce UV exposure. Daily broad-spectrum sunscreen, shade, protective clothing, and no tanning beds. (Weighing formulas? See chemical vs mineral sunscreen.)
Check your skin. A monthly skin self-exam helps you catch changes early, and a dermatologist can do professional skin checks based on your risk.

Why a tool can't diagnose this

It's worth stating plainly: no photo, app, or automated tool — including ours — can diagnose skin cancer. The types overlap in appearance, benign spots imitate them, and a definitive answer nearly always requires a biopsy. A private skin assessment can help you document and describe a spot before a visit, but for anything possibly cancerous it is informational only and not a substitute for seeing a doctor.

When to see a doctor

Book an appointment with a board-certified dermatologist if you notice (AAD):

A new growth, mole, or patch — especially one that's changing.
A spot that itches, bleeds, crusts, or won't heal.
A pearly bump, a rough scaly patch, or a non-healing sore.
A mole matching the ABCDEs or one that's the "ugly duckling" among your spots.
A dark streak under a fingernail or toenail.

Most suspicious spots turn out to be harmless — but skin cancer is common, and catching it early is what makes it so treatable. When something is new, changing, or just doesn't seem right, get it looked at in person. That's never an overreaction.