Skin cancer can look like a pearly bump, a scaly patch, a changing mole, or even a spot that simply won’t heal. There’s no single appearance, because the three main types of skin cancer each show up differently on the skin. Some forms don’t even look like what most people picture when they think of cancer. Knowing the specific visual signs of each type makes it far easier to catch something early.
Basal Cell Carcinoma
Basal cell carcinoma is the most common skin cancer, and it often looks deceptively harmless. On lighter skin, it typically appears as a shiny, translucent bump with a pearly white or pink tone. You can sometimes see tiny blood vessels running through or around it. On brown and Black skin, the same cancer often looks like a glossy brown or black bump with a rolled, raised border.
Other forms of basal cell carcinoma show up as flat, brown, black, or blue lesions with dark spots and a slightly raised, translucent edge. Some look like open sores that bleed, ooze, then crust over but never fully heal. This is one of the most important clues: a sore that keeps cycling through healing and reopening over weeks or months is worth getting checked.
Basal cell carcinoma grows slowly, typically less than 1 millimeter per month, and it can take months to years before the spot becomes obviously abnormal. That slow pace means people often dismiss it as a pimple or minor irritation. It rarely spreads to other parts of the body, but left untreated it can grow into surrounding tissue and cause significant damage.
Squamous Cell Carcinoma
Squamous cell carcinoma has a rougher, more textured look than basal cell. It commonly appears as a firm bump (called a nodule) that can be pink, red, brown, or black depending on your skin tone. It can also show up as a flat sore topped with a scaly, crusty surface that doesn’t go away.
A few presentations are especially worth knowing. On the lip, it often starts as a rough, scaly patch that eventually breaks open into a sore. Inside the mouth, it can look like a persistent rough patch or sore. It also appears as raised, wartlike growths on the genitals or anus. One red flag is a new sore or raised area that develops on an old scar, because damaged skin is more vulnerable to this type of cancer.
Melanoma and the ABCDE Rule
Melanoma is less common than the other two but far more dangerous, so catching it early matters enormously. The National Cancer Institute uses the ABCDE rule to describe what early melanoma looks like:
- Asymmetry: One half of the mole or spot doesn’t match the other half.
- Border: The edges are ragged, notched, or blurred rather than smooth. Pigment may spread into surrounding skin.
- Color: Multiple shades are present in the same spot, including combinations of black, brown, tan, white, gray, red, pink, or blue.
- Diameter: Most melanomas are larger than 6 millimeters (about the size of a pencil eraser), though they can be smaller.
- Evolving: The spot has changed in size, shape, or color over weeks or months.
Not every melanoma checks all five boxes, especially in its earliest stages. The “evolving” criterion is arguably the most useful single clue. Any mole or spot that is clearly different from what it looked like a few weeks ago deserves attention, even if it doesn’t meet the other criteria.
Melanoma That Doesn’t Look Like Melanoma
There’s a form called amelanotic melanoma that lacks the dark pigment most people associate with the disease. Instead, it appears as a pink or red spot on the skin. Because it doesn’t look like a typical mole, it’s often mistaken for a pimple, bug bite, or minor rash, and it tends to be diagnosed at a later, more advanced stage. If you have a pink or reddish bump that persists for several weeks and doesn’t respond to typical skin treatments, it’s worth having a dermatologist look at it.
Skin Cancer on Darker Skin
Skin cancer in people with darker skin tones often shows up in locations that get little or no sun exposure, which is the opposite of what most people expect. The most common form of melanoma in people with dark skin is acral lentiginous melanoma, and it appears on the palms of the hands, the soles of the feet, or under fingernails and toenails.
On the palm or sole, it looks like a dark, irregularly shaped patch. Under a nail, it appears as a dark band running lengthwise. A dark band under a nail that begins to widen or spread is a particularly important warning sign. These locations are easy to overlook during casual self-checks, which is one reason skin cancer in darker-skinned individuals is often caught later.
Precancerous Spots to Watch
Actinic keratoses are precancerous patches that can develop into squamous cell carcinoma if left untreated. They feel rough and dry, often described as having a sandpaper-like texture. They’re usually small, under an inch across, and can be flat or slightly raised. Color ranges from pink to red to brown. Some develop a hard, wartlike surface. These patches tend to appear on areas that get the most sun: the face, ears, scalp, forearms, and backs of the hands. A single actinic keratosis carries a small risk of becoming cancerous, but having several increases that risk, and a dermatologist can treat them easily before they progress.
How to Tell Cancer From Harmless Growths
One of the most common look-alikes is seborrheic keratosis, a benign growth that shows up frequently after age 40. These patches are raised, waxy, and can range in color from white to black. People sometimes mistake them for unusual-looking scabs. They can appear anywhere on the body and are completely harmless.
The key differences come down to behavior over time. Seborrheic keratoses are typically flat, waxy, painless, and stable. They don’t change shape or color once they’ve formed. Melanoma, by contrast, tends to be asymmetrical, multi-colored, and actively changing. If you have a growth that initially looked like a harmless waxy patch but starts shifting in shape, color, or size, that change is the signal that something else may be going on.
A useful general principle for any suspicious spot: skin cancers tend to do something. They grow, they change color, they bleed without being bumped, they crust and reopen, or they simply refuse to heal. A spot that sits there unchanging for years is far less concerning than one that looked different three months ago.
Checking Your Own Skin
No major U.S. medical organization currently recommends routine skin cancer screening by a clinician for people without symptoms or risk factors. That puts more responsibility on you to notice changes on your own body. The most effective approach is simply becoming familiar with what your skin normally looks like so you can spot when something new appears or something old starts changing.
Pay attention to areas that are easy to forget: the scalp (use a mirror or ask someone to look), between the toes, the soles of the feet, under the nails, and behind the ears. If you have a personal or family history of skin cancer, professional skin exams become more relevant, and your doctor can help determine how often you should be seen.