Skin cancer can look like a pearly bump, a scaly red patch, a sore that won’t heal, or a mole that’s changed shape or color. There’s no single appearance, because the three main types of skin cancer each show up differently on the skin. Knowing what to look for with each type gives you a real advantage: when melanoma is caught early and still localized, the five-year survival rate is over 97%.
Basal Cell Carcinoma
Basal cell carcinoma (BCC) is the most common skin cancer, and it’s often the least dramatic-looking. On lighter skin, it typically appears as a shiny, somewhat translucent bump with a pearly white or pink tone. You might notice tiny blood vessels running across the surface. The bump can bleed, scab over, and then seem to heal before opening up again. That cycle of bleeding and scabbing without ever fully resolving is one of the clearest warning signs.
On brown and Black skin, BCC often looks brown or glossy black with a slightly rolled, raised border around the edges. This can make it harder to distinguish from a harmless mole at first glance.
Not all basal cell carcinomas are bumps. Some appear as flat, scaly patches with a slightly raised edge. Others look like a white, waxy, scar-like area with no clear border. This last type is easy to overlook because it doesn’t look like what most people picture when they think of cancer. If you notice a patch of skin that looks like a scar in a spot where you were never injured, that’s worth getting checked.
Squamous Cell Carcinoma
Squamous cell carcinoma (SCC) tends to look rougher and more textured than basal cell. It often shows up as a firm bump (called a nodule) that can be skin-colored, pink, red, brown, or black depending on your skin tone. It can also appear as a flat sore topped with a scaly crust, or as a rough, scaly patch on the lip that may develop into an open sore.
One pattern to watch for: a new sore or raised area developing on top of an old scar or wound. SCC can also develop inside the mouth as a sore or rough patch that doesn’t go away. These lesions tend to feel firm and may be tender. Unlike a cut or scrape that follows a predictable healing timeline, squamous cell spots persist for weeks and often get larger.
What Melanoma Looks Like
Melanoma is the most dangerous common skin cancer, and it usually starts as either a new mole or a change in an existing one. The ABCDE rule, developed by the National Cancer Institute, is the most reliable way to evaluate a suspicious spot:
- Asymmetry: One half of the mole doesn’t match the other half.
- Border: The edges are ragged, notched, or blurred rather than smooth and round. Pigment may spread into the surrounding skin.
- Color: The mole contains uneven shades of black, brown, and tan. You might also see areas of white, gray, red, pink, or blue mixed in.
- Diameter: The spot is larger than 6 millimeters across, roughly the size of a pencil eraser. Melanomas can be smaller than this, but most are at or above that threshold.
- Evolving: The mole has changed in size, shape, or color over the past few weeks or months.
Any single one of these features is reason enough to have a dermatologist take a look. You don’t need all five to be present.
Nodular Melanoma
Not all melanomas follow the ABCDE pattern. Nodular melanoma grows vertically into the skin rather than spreading outward, so it may look like a raised, firm bump rather than a flat, irregular mole. It can resemble a blood blister and is usually hard to the touch. The key feature is speed: nodular melanoma develops rapidly over weeks to months. If you notice a new raised growth that feels firm and is getting bigger quickly, don’t wait to see if it changes further.
Skin Cancer on Darker Skin Tones
Skin cancer looks different on darker skin, and it also tends to appear in different locations. Acral lentiginous melanoma is the most common type of melanoma in people of color, and it develops on the palms of the hands, soles of the feet, or under the nails. On the palm or sole, it starts as a black or brown discoloration that may look like a bruise or stain but grows in size over time instead of fading.
When this type develops under a fingernail or toenail (called subungual melanoma), it looks like a dark vertical streak running through the nail bed. People sometimes mistake it for dried blood or a fungal infection. As it progresses, the nail may crack or break. Because these locations aren’t where most people think to check for skin cancer, these melanomas are often caught later. Regularly checking the bottoms of your feet, between your toes, and under your nails can make a real difference.
Precancerous Spots to Watch
Actinic keratoses are rough, dry, scaly patches caused by years of sun exposure. They’re usually less than an inch across and feel like sandpaper when you run your finger over them. They can be pink, red, or brown, and may itch, burn, or occasionally bleed. Some develop a hard, wart-like surface.
These spots aren’t cancer yet, but about 5% to 10% of untreated actinic keratoses eventually progress to squamous cell carcinoma. If you have several of these patches, treating them early eliminates that risk entirely. Dermatologists can typically handle them in a single office visit.
Harmless Growths That Mimic Cancer
Not every unusual spot is dangerous. Seborrheic keratoses are extremely common benign growths that can look alarming. They appear as slightly raised, waxy, discolored patches that range from white to black. People often describe them as looking like something stuck onto the skin, almost like a scab or a blob of wax. They can show up anywhere on the body and tend to accumulate with age.
The key differences from melanoma: seborrheic keratoses are typically flat, painless, and stable in size. They don’t have the irregular borders or mixed colors characteristic of melanoma, and they don’t change or grow over weeks the way a melanoma does. That said, if you’re unsure whether a spot is a harmless keratosis or something more concerning, the safest move is to have it evaluated. Even experienced dermatologists sometimes need a biopsy to tell the difference.
The Overarching Warning Signs
Across all types of skin cancer, a few patterns consistently signal trouble. A sore that won’t heal within a few weeks is one of the most reliable red flags, whether it’s a bump that keeps bleeding, a patch that crusts and reopens, or an open wound that simply persists. Any new growth that appears and keeps getting larger deserves attention. So does any existing mole or spot that changes in color, shape, size, or texture.
About 83% of melanomas are diagnosed while still localized to the skin, before they’ve spread. At that stage, treatment is straightforward and the prognosis is excellent. The difference between an early catch and a late one often comes down to simply paying attention to changes on your skin and acting on them promptly rather than waiting to see what happens.