Skin cancer spots don’t all look the same. They vary depending on the type of cancer, where it appears on the body, and the color of your skin. Some look like shiny bumps, others like flat scaly patches, and some mimic ordinary moles. Knowing the specific visual clues for each type helps you catch a problem early, when treatment is simplest.
Basal Cell Carcinoma: The Most Common Type
Basal cell carcinoma accounts for the majority of skin cancers, and it tends to show up on sun-exposed areas like the face, ears, and neck. On lighter skin, the classic sign is a shiny, translucent bump that looks pearly white or pink. You can sometimes see tiny blood vessels running through or around it. On darker skin, the same type of cancer can appear as a brown, glossy black, or tan bump with a rolled, slightly raised border.
Not all basal cell carcinomas are bumps. Some look like a white, waxy, scarlike patch with no clear border. These flat versions are easy to overlook because they don’t resemble what most people picture when they think of cancer. Others may look like a persistent open sore that heals and then reopens.
Squamous Cell Carcinoma: Scaly and Firm
Squamous cell carcinoma is the second most common skin cancer. It often appears as a firm bump or a flat sore topped with a scaly, crusty surface. The color varies widely: it can match your surrounding skin tone, or it can look pink, red, brown, or black. On the lip, it frequently starts as a rough, scaly patch that may eventually break open into a sore.
One distinguishing feature is that squamous cell spots sometimes develop on top of old scars or long-standing sores. They can also appear in places you might not expect, including inside the mouth and on the genitals. A new raised or wartlike growth in any of these locations is worth getting checked.
Melanoma and the ABCDE Rule
Melanoma is less common than basal or squamous cell carcinoma, but it’s the most dangerous because it can spread to other organs. The American Academy of Dermatology uses a five-letter checklist to describe the warning signs:
- Asymmetry. One half of the spot doesn’t mirror the other half.
- Border. The edges are ragged, scalloped, notched, or blurred rather than smooth. Pigment may bleed into the surrounding skin.
- Color. Instead of one uniform shade, you see a mix of tan, brown, black, white, red, pink, blue, or gray within the same spot.
- Diameter. Most melanomas are larger than 6 millimeters (roughly the size of a pencil eraser) when diagnosed, though they can be smaller.
- Evolving. The spot has changed in size, shape, or color over the past few weeks or months, or it looks noticeably different from your other moles.
That last point connects to what dermatologists call the “ugly duckling” sign. Most of your moles probably share a general family resemblance: similar size, shape, and color. A mole that stands out as the oddball, the one that doesn’t look like the rest, deserves closer attention even if it doesn’t check every ABCDE box.
Melanoma Without Dark Color
Not every melanoma is dark brown or black. A form called amelanotic melanoma has little to no pigment, so it can appear pink, red, or skin-colored. Because it lacks the typical dark color, it often doesn’t trigger the usual ABCDE warning bells. It may look like a pinkish scaly patch, a small raised nodule, or a reddish flat spot with irregular borders. Some have a faint ring of tan, brown, or gray pigment at the edges, but many don’t.
Dermatologists suggest adding three extra red flags for these harder-to-spot cases: red, raised, and recent change. If you have a spot that is persistently pink or red, is raised above the surrounding skin, and appeared or changed recently, treat it with the same urgency as a dark, irregular mole.
What Skin Cancer Looks Like on Darker Skin
Skin cancer can affect any skin tone, but it often shows up in different locations and with different coloring in people with darker complexions. The most common melanoma subtype in people with dark skin is acral lentiginous melanoma, which develops on the palms, soles of the feet, fingers, toes, and under the nails. It can appear as a dark patch on the palm or sole, or as a dark band running lengthwise beneath a fingernail or toenail.
Basal cell carcinoma on darker skin tends to look like a glossy black, brown, or tan bump with a rolled border, rather than the pearly pink bump seen on lighter skin. Squamous cell carcinoma can be the same color as your skin or appear as a firm bump or scaly patch in shades of pink, red, brown, or black. Because these cancers may blend more easily into the surrounding skin, checking areas that get less sun exposure, like the soles of your feet and nail beds, is especially important.
Pre-Cancerous Spots: Actinic Keratosis
Before a spot becomes a full-blown squamous cell carcinoma, it often starts as a pre-cancerous patch called an actinic keratosis. These feel rough, dry, and crusty. Many people describe the texture as sandpaper: you can sometimes feel one before you see it. They may be pink, red, brown, or gray, and they range from a thin, flat discolored area to a more raised, scaly patch. They’re most common on areas that have accumulated years of sun exposure, like the face, scalp, forearms, and backs of the hands.
Actinic keratoses don’t always progress to cancer, but a percentage of them do. Having them treated or monitored removes that risk.
Telling Cancer Apart From Harmless Growths
One of the most common lookalikes is seborrheic keratosis, a benign growth that becomes increasingly common with age. These can appear brown, black, or tan and sometimes look alarming, but they have a characteristic “stuck-on” quality, as if someone glued a waxy, flat blob onto the surface of the skin. They’re painless and don’t change rapidly the way a melanoma would. If a growth has that clearly stuck-on, waxy appearance and hasn’t shifted in size, shape, or color, it’s more likely benign.
That said, visual inspection alone isn’t foolproof. The features that separate a melanoma from a harmless mole, or a basal cell carcinoma from a pimple that won’t heal, can be subtle. A spot that bleeds without clear cause, doesn’t heal within a few weeks, keeps crusting over and reopening, or is visibly changing deserves a professional look. A dermatologist can often evaluate a suspicious spot in a single visit, sometimes using a handheld magnifying device that reveals structures invisible to the naked eye.