Skin cancer can look like a shiny bump, a scaly patch, a sore that won’t heal, or a mole that’s changing shape or color. The specific appearance depends on the type of skin cancer, your skin tone, and how far it has progressed. Knowing what to watch for matters: localized melanoma has a 97.6% five-year survival rate, but that drops to 16.2% once it spreads to distant parts of the body. Early recognition makes an enormous difference.
Basal Cell Carcinoma
Basal cell carcinoma is the most common type of skin cancer, and it takes several different forms. On lighter skin, it often shows up as a firm, raised, round growth that looks shiny and pink or red. On darker skin tones, that same bump tends to appear brown, black, or blue. Sometimes it’s the same color as the surrounding skin, making it easy to miss.
Not every basal cell carcinoma looks like a bump. It can also appear as a rough, scaly patch, particularly on or near the ears. Some look like a round area with a dip or crater in the center that may scab over and bleed repeatedly. Others resemble a freckle or age spot but feel rough or scaly to the touch. One of the most telling signs is a sore that seems to heal but keeps coming back, or one that simply never heals at all. Basal cell carcinomas can also contain more than one color within the same spot.
Squamous Cell Carcinoma
Squamous cell carcinoma is the second most common skin cancer. It typically appears as a firm bump (called a nodule) that can be skin-colored, pink, red, black, or brown depending on your skin tone. It can also show up as a flat sore topped with a scaly crust, or as a raised, wart-like growth.
One pattern worth knowing: a new sore or raised area that develops on top of an old scar or a pre-existing wound. This is a classic squamous cell presentation. On the lips, it often starts as a rough, scaly patch that eventually opens into a sore. Squamous cell carcinoma can also develop inside the mouth or on the genitals, where it appears as a sore or rough patch that doesn’t resolve on its own.
Melanoma and the ABCDE Rule
Melanoma is less common than basal or squamous cell carcinoma but far more dangerous. Dermatologists use the ABCDE rule to describe its warning signs:
- Asymmetry: One half of the mole or spot doesn’t match the other half.
- Border: The edges look ragged, notched, or blurred, and pigment may spread into surrounding skin.
- Color: The spot contains multiple shades of brown, black, or tan. Areas of white, gray, red, pink, or blue may also appear.
- 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.
Any single one of these features is worth getting checked. You don’t need all five to be present.
Melanoma That Doesn’t Look Like Melanoma
About 5% of melanomas are “amelanotic,” meaning they lack the dark pigment most people associate with the disease. These appear as pink or red spots on the skin rather than brown or black ones. Because they look so different from what people expect, amelanotic melanomas are often confused with harmless skin irritations and tend to be diagnosed at a later, more advanced stage. If you have a pink or red spot that’s growing, changing, or not healing, don’t assume it’s benign just because it isn’t dark.
How Skin Cancer Looks on Darker Skin
Skin cancer presentations shift meaningfully across skin tones, and most reference images online show lighter skin. On darker skin, basal cell carcinoma often appears as a shiny brown, black, or blue bump rather than the pink or pearly version seen on lighter skin. Squamous cell nodules can look black or dark brown.
The most important difference involves melanoma. In people with dark skin, the most common form is acral lentiginous melanoma, which develops in places that get little sun exposure: the palms of the hands, the soles of the feet, and under the fingernails or toenails. It can look like a dark patch on your palm or the bottom of your foot, or a dark band running lengthwise under a nail. These are areas most people never think to check, which is one reason melanoma in people with darker skin is often caught later.
Precancerous Spots
Not everything that looks suspicious is cancer, but some spots are on their way there. Actinic keratoses are rough, dry, scaly patches of skin that develop from years of sun exposure. They’re usually less than an inch across and can be flat or slightly raised. Their color ranges from pink to red to brown. Some develop a hard, wart-like surface. These patches feel rough, almost like sandpaper, which often makes them easier to detect by touch than by sight. Left untreated, a small percentage of actinic keratoses progress to squamous cell carcinoma.
Rare Types Worth Recognizing
Merkel cell carcinoma is uncommon but aggressive. It shows up as a painless bump on the skin that grows quickly. The bump can look pink, purple, red-brown, or match the surrounding skin color. Like melanoma, it can be asymmetrical. The key distinguishing feature is speed: if a new bump appears and grows noticeably over just a few weeks, that rapid pace of growth sets it apart from slower-developing skin cancers and warrants prompt evaluation.
How to Check Your Own Skin
A monthly self-exam is the standard recommendation. Stand in front of a full-length mirror and use a handheld mirror to check areas you can’t see directly: your back, the backs of your legs, your scalp (a partner helps here). Don’t skip the spaces between your toes, the soles of your feet, your palms, your nail beds, and behind your ears.
The most practical screening strategy is pattern recognition. You’re looking for the outlier: the one spot that doesn’t look like anything else on your body. If most of your moles are small, round, and brown, the one that’s larger, irregularly shaped, or multicolored deserves attention. Similarly, any new growth that appears after age 30, any sore that bleeds and doesn’t heal within a few weeks, and any existing mole that starts changing should be evaluated by a dermatologist. Taking photos of spots you’re watching and comparing them month to month makes it much easier to notice subtle changes over time.