Skin cancer can look like a pearly bump, a scaly red patch, a dark irregular mole, or even a pink spot that won’t heal. 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 across all three types gives you the best chance of catching something early.
Basal Cell Carcinoma
Basal cell carcinoma is the most common skin cancer, and it often looks deceptively harmless. On lighter skin, the classic sign is a small, slightly translucent or pearly bump that’s skin-colored or pink. You can sometimes see tiny blood vessels running through or around it. On brown and Black skin, the same bump tends to appear brown or glossy black with a rolled, raised border.
Not all basal cell carcinomas look like bumps, though. Some appear as flat, scaly patches that slowly expand over months or years. Others resemble a white, waxy, scar-like area with no clear edge. One hallmark across all forms is that the spot may bleed, scab over, and then seem to heal, only to bleed again. A sore that keeps cycling through this pattern is worth getting checked.
Squamous Cell Carcinoma
Squamous cell carcinoma tends to look rougher and angrier than basal cell. It often shows up as a firm bump or nodule that can be pink, red, brown, or black depending on your skin tone. Some appear as flat sores topped with a thick, scaly crust. A rough, scaly patch on the lip that eventually breaks open into a sore is another common presentation.
One pattern that catches people off guard: a new raised or thickened area developing on an old scar or a wound that healed long ago. Squamous cell carcinoma can also appear inside the mouth as a sore or rough patch. These cancers tend to develop in areas that get repeated sun exposure, like the face, ears, hands, and forearms.
Melanoma and the ABCDE Rule
Melanoma is the most dangerous common skin cancer, and there’s a well-established checklist for spotting it early. The ABCDE rule breaks down the five visual warning signs:
- Asymmetry: One half of the mole doesn’t match the other.
- 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 brown, black, and tan. You might also see patches of 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 the past few weeks or months.
Any single one of these features is enough reason to have a dermatologist take a look. You don’t need all five to be present.
Nodular Melanoma Looks Different
The ABCDE rule works well for the most common type of melanoma, which tends to spread outward across the skin’s surface first. But nodular melanoma grows downward fast, and it doesn’t always follow those rules. It may appear as a raised, dome-shaped bump that’s uniform in color. For this type, dermatologists use a simpler set of warning signs: elevated, firm, and growing. If a new bump on your skin is raised, feels firm to the touch, and is noticeably larger than it was days or weeks ago, that’s concerning.
Melanoma Without Dark Color
Most people associate melanoma with dark brown or black spots, but a form called amelanotic melanoma has little or no pigment. It appears as a pink or red spot on the skin and is easily mistaken for a pimple, bug bite, or irritated patch. Because it doesn’t look like what most people expect melanoma to look like, it’s often diagnosed at a later stage. A pink or red bump that persists, grows, or doesn’t respond to typical treatment deserves attention.
Skin Cancer on Darker Skin
Skin cancer in people with darker skin tones often shows up in places that get little sun, which is part of why it’s frequently missed. The most common melanoma in people with dark skin is acral lentiginous melanoma, which develops on the palms of the hands, the soles of the feet, and under or around the nails. It can look like a dark patch on your palm or the bottom of your foot, or a dark band running lengthwise under a fingernail or toenail.
Basal cell carcinoma in darker skin tends to appear brown or glossy black with a raised, rolled border, which can be mistaken for a harmless mole. The tiny blood vessels that are a telltale sign on lighter skin can be harder to see. Paying attention to any spot that bleeds, crusts, or slowly changes remains the most reliable approach regardless of skin tone.
The Ugly Duckling Sign
Beyond examining individual spots, one of the most practical screening methods is simply comparing your moles to each other. Moles on the same person tend to look alike. They share a similar color, size, and pattern. A mole that stands out as clearly different from all the others, the “ugly duckling,” is more likely to be problematic. This doesn’t require any medical knowledge. If you’re looking at your arm and one spot just doesn’t match the rest, that’s the one to have evaluated.
Pre-cancerous Spots to Watch
Not everything that looks suspicious is cancer yet. Actinic keratoses are rough, dry, scaly patches that develop from years of sun exposure. They’re usually less than an inch across and feel like sandpaper when you run your finger over them. Some are flat, others slightly raised, and some develop a hard, wart-like surface. These spots are pre-cancerous, meaning a small percentage of them will eventually turn into squamous cell carcinoma if left untreated. They’re common on the face, scalp (especially in people with thinning hair), ears, and backs of the hands.
Rare Types
Merkel cell carcinoma is uncommon but aggressive. It typically appears as a single, painless bump on the skin that grows rapidly over days to weeks. The bump can look pink, purple, red-brown, or match the surrounding skin color. Its sides are often asymmetrical. Because it’s painless and doesn’t look alarming at first, it’s easy to dismiss. The rapid growth is the key warning sign. Any new bump that’s noticeably bigger within a couple of weeks should be evaluated promptly.