Skin cancer can look like a pearly bump, a scaly red patch, a dark streaky mole, or even a sore that simply won’t heal. There is no single appearance. The three main types, basal cell carcinoma, squamous cell carcinoma, and melanoma, each show up differently on the skin, and all three can look different again depending on your skin tone. Knowing what to watch for matters: melanoma caught at its earliest stage has a five-year survival rate of nearly 100%, compared to 34% once it has spread to distant parts of the body.
Basal Cell Carcinoma
Basal cell carcinoma is the most common skin cancer, and it often looks surprisingly subtle. On lighter skin, it typically appears as a small, slightly transparent or pearly bump that’s skin-colored or pink. You might notice tiny blood vessels running across its surface. On brown and Black skin, the same cancer often shows up as a brown or glossy black bump with a rolled, raised border.
Not all basal cell carcinomas look like bumps, though. Some appear as flat, scaly patches with or without a raised edge. Others resemble a white, waxy, scar-like area with no clear border, which makes them easy to overlook entirely. A hallmark behavior is bleeding and scabbing over repeatedly. If you have a spot that bleeds, forms a scab, seems to heal, and then opens up again, that cycle is worth paying attention to.
Squamous Cell Carcinoma
Squamous cell carcinoma tends to look rougher and more irritated than basal cell. It can show up as a scaly, crusty patch of skin, a firm dome-shaped growth, a wart-like bump, or even a horn-shaped protrusion rising from the skin’s surface. Some lesions look like an open sore surrounded by a ring of raised skin. Scabbing and bleeding are common.
One important detail: squamous cell carcinoma can develop inside existing scars, wounds, or chronic sores. If a scar you’ve had for years suddenly develops a new growth, starts bleeding, or develops bumps, that change is significant. Any sore that refuses to heal, or that heals and then returns, fits the pattern worth investigating.
Melanoma and the ABCDE Rule
Melanoma is the most dangerous common skin cancer, and it usually begins as either a new mole or a visible change in one you already have. The National Cancer Institute uses five features, known as the ABCDE rule, to describe what early melanoma looks like:
- Asymmetry: One half of the mole doesn’t match the other.
- Border irregularity: The edges are ragged, notched, or blurred rather than smooth. Pigment may spread into surrounding skin.
- Color that is uneven: Instead of a single shade, you see a mix of black, brown, tan, white, gray, red, pink, or blue within the same spot.
- Diameter: Most melanomas are larger than 6 millimeters across (roughly the size of a pencil eraser), though they can be smaller.
- Evolving: The mole has changed in size, shape, or color over recent weeks or months.
That last criterion, evolution, is arguably the most useful. A mole that has looked the same for a decade is far less concerning than one that’s visibly different from a month ago. Any spot that is growing, darkening, developing new colors, or changing shape deserves a closer look.
Melanoma That Doesn’t Look Like Melanoma
Not all melanomas are dark. A variant called amelanotic melanoma contains little or no pigment and often appears as a pink, red, or skin-colored bump or flat spot. Because it lacks the dark coloring people associate with melanoma, it can be mistaken for a pimple, a cyst, a scar, or even a harmless skin growth. This type is harder to catch early precisely because it doesn’t match the classic ABCDE picture. A new pink or reddish spot that persists, grows, or doesn’t behave like a normal blemish is worth having examined.
What Skin Cancer Looks Like on Darker Skin
Skin cancer on darker skin tones often shows up in locations people don’t expect. A type called acral lentiginous melanoma develops exclusively on the palms of the hands, the soles of the feet, or under the fingernails and toenails. On the palms or soles, it typically appears as an unevenly pigmented black or brown spot that looks different from the surrounding skin and grows over time. Under a nail, it may show up as a dark streak or band of color growing from the cuticle toward the tip.
These spots are frequently dismissed. Patients often report thinking the mark was just a bruise, a blood blister, or a wart. Clinicians at MD Anderson Cancer Center use the CUBED checklist for these areas: unusual Color, Uncertain diagnosis, Bleeding, Enlargement, and Delay in healing. If a dark spot on your palm, sole, or nail bed matches any of those features, it’s not something to wait on.
Pre-Cancerous Spots
Before skin cancer develops, you may notice a precursor called actinic keratosis. These rough, scaly patches feel like sandpaper and are often easier to detect by touch than by sight. They can be red, tan, pink, brown, silvery, or skin-colored. Some are flat, others slightly raised or crusty. The skin may feel raw, sensitive, or itchy with a prickling or burning sensation. Actinic keratoses don’t always become cancer, but a percentage of them progress to squamous cell carcinoma over time, so treating them early removes that risk.
Harmless Growths That Mimic Cancer
Not every alarming-looking spot is cancerous. Seborrheic keratoses are among the most common benign growths, and they can look genuinely worrying. They range in color from white to black, appear patchy, and often look like waxy, stuck-on scabs. They can show up anywhere on the body. The challenge is that in some people, a melanoma can closely resemble a seborrheic keratosis, and telling them apart by eye alone isn’t always reliable, even for dermatologists. If a growth you assumed was harmless starts changing, growing, or bleeding, the safe move is to have it checked.
Warning Signs That Apply to All Types
Across every type of skin cancer, a few behaviors show up repeatedly. A sore that looks crusty, has a depression in the middle, or bleeds frequently. A wound that won’t heal, or one that heals and then comes back in the same spot. A rough, scaly lesion that itches, bleeds, and crusts over. These are not normal parts of skin aging, and they don’t resolve on their own.
The overall pattern to watch for is persistence and change. Healthy skin heals. A cut closes up. A pimple runs its course. When a spot on your skin breaks that pattern by refusing to heal over three to four weeks, by cycling between scabbing and reopening, or by slowly but steadily growing, that behavior is the signal. Skin cancer doesn’t always look dramatic. Sometimes it just looks like something small that won’t go away.