Skin cancer can look like a pearly bump, a scaly red patch, a dark mole with uneven edges, or even a pink spot with no color at all. There is 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. The classic form is a small, shiny or pearly bump with a smooth surface. Tiny blood vessels frequently cross over the bump, giving it a slightly reddish or translucent quality. As it grows, the center may dip inward or develop a small open sore, while the edges appear raised and rolled, almost like a tiny crater rim.
Not all basal cell carcinomas look like bumps, though. A superficial type can appear as a flat, pinkish patch with a thin, slightly raised border. It may resemble a patch of eczema or dry skin that never fully heals. On darker skin tones, basal cell carcinoma can show up as a brown, glossy black, or tan bump with that same characteristic rolled border. Because these growths rarely hurt or itch, they’re easy to ignore for months.
Squamous Cell Carcinoma
Squamous cell carcinoma tends to look rougher and more irritated than basal cell. A common presentation is a flat sore topped with a thick, scaly crust. It can also appear as a firm, raised bump or a wart-like growth that bleeds when scratched or bumped. On the lips, it often starts as a rough, scaly patch that eventually breaks open into a persistent sore.
This type of cancer can match your natural skin tone, making it harder to spot, or it may appear pink, red, brown, or black depending on your complexion. It sometimes develops on old scars or areas of chronic skin damage, showing up as a raised, thickened area that wasn’t there before. The key signal is any sore or rough patch that doesn’t heal within a few weeks, especially on sun-exposed areas like the face, ears, hands, or forearms.
Melanoma and the ABCDE Rule
Melanoma is less common than the other two types but far more dangerous. It usually develops in or near an existing mole, and the ABCDE rule is the standard way to evaluate whether a mole looks suspicious:
- Asymmetry: One half of the mole doesn’t mirror the other half.
- Border irregularity: The edges are ragged, notched, or blurred rather than smooth. Pigment may bleed into the surrounding skin.
- Color that is uneven: Instead of one uniform shade, you see a mix of black, brown, tan, white, gray, red, pink, or blue within the same spot.
- Diameter: The spot is larger than 6 millimeters, roughly the size of a pencil eraser. Melanomas can be smaller, but most exceed this threshold.
- Evolving: The mole has changed in size, shape, or color over the past few weeks or months.
On darker skin, melanoma can look like a dark or black bump that appears waxy or shiny. It doesn’t always appear on sun-exposed areas. The most common form of melanoma in people with dark skin is acral lentiginous melanoma, which develops on the palms, soles of the feet, fingers, toes, or under the nails. Under a nail, it looks like a dark band running lengthwise. If that band starts widening or spreading, that’s a sign worth getting checked promptly.
Nodular Melanoma: When ABCDE Doesn’t Apply
Some melanomas grow quickly as raised, dome-shaped bumps rather than spreading outward like a flat mole. These nodular melanomas can be uniformly colored and relatively symmetrical, which means they don’t trigger the usual ABCDE warning signs. For these, clinicians use a different set of criteria called the EFG rule: Elevated above the skin surface, Firm to the touch (more solid than soft), and Growing progressively over weeks or months. If you notice a new bump that fits this description, particularly one that is dark, pink, or red and increasing in size, treat it with urgency.
Skin Cancer That Has No Color
About 2% of melanomas produce little or no pigment. These amelanotic melanomas typically appear as a pink to red bump, flat spot, or fleshy nodule that blends in with surrounding skin. Because they lack the dark coloring people associate with melanoma, they’re frequently mistaken for a pimple, bug bite, or minor irritation. This leads to delayed diagnosis, and by the time amelanotic melanomas are caught, they tend to be thicker and more advanced than pigmented melanomas, with lower survival rates. Any pink or reddish bump that persists for more than a few weeks and doesn’t respond to basic wound care deserves a closer look.
Precancerous Spots to Watch
Before skin cancer develops, you may notice actinic keratoses: rough, scaly patches caused by years of sun exposure. They feel like sandpaper when you run a finger over them and can be pink, red, brown, gray, or darker than your natural skin tone. They show up most often on the face, scalp (especially in people with thinning hair), forearms, and backs of the hands. Not every actinic keratosis turns into cancer, but a small percentage progress to squamous cell carcinoma over time, so treating them early removes that risk.
Harmless Spots That Mimic Cancer
Seborrheic keratoses are among the most common benign growths that get mistaken for skin cancer, especially melanoma. They appear as waxy, slightly raised patches that look almost “stuck on” to the skin, as if you could peel them off. They range from white to black and can show up anywhere on the body. The key differences: seborrheic keratoses are typically flat or only slightly raised, feel waxy rather than firm, and are painless. They also tend to have a uniform, patchy texture without the irregular borders or multiple colors seen in melanoma. That said, a new dark growth that you can’t confidently identify is always worth a professional evaluation, because the visual overlap between benign and malignant spots can fool even trained eyes.
Merkel Cell Carcinoma
Merkel cell carcinoma is rare but aggressive. It appears as a small, firm, painless bump or nodule on the skin, often on sun-exposed areas like the face, neck, arms, or legs. The bump can be flesh-colored, red, or bluish-purple, and it grows rapidly over weeks. It’s most common in people over 70 and in those with weakened immune systems. Because it looks unremarkable at first, the hallmark clue is speed: a painless bump that noticeably increases in size over a short period is worth immediate attention.
What to Check and Where
Most people focus on obvious moles on their arms and face, but skin cancer develops in less visible places too. Check the soles of your feet, between your toes, under your nails, behind your ears, and on your scalp. For darker skin tones, pay special attention to the palms, soles, and nail beds, where acral lentiginous melanoma is most likely to appear.
Look for anything new, anything changing, and anything that doesn’t heal. A sore that bleeds and scabs over repeatedly, a shiny bump that slowly enlarges, a mole that shifts color over a few weeks, a rough patch that won’t go away: these are the patterns that matter more than any single visual description. Skin cancer rarely hurts in its early stages, so pain is not a reliable signal. What you see, and what changes over time, is your best early warning system.