Skin cancer spots vary widely depending on the type, but most share a common trait: they look different from your other spots and they change over time. Some appear as pearly bumps, others as scaly red patches, and some mimic ordinary moles with a few subtle warning signs. Knowing what to look for across the three main types of skin cancer can help you catch something early, when treatment is simplest.
Basal Cell Carcinoma: The Most Common Type
Basal cell carcinoma accounts for the majority of skin cancers and tends to grow slowly. The classic spot is a small, round, flesh-colored or pinkish bump with a waxy, pearly sheen. Tiny blood vessels are often visible across the surface, giving it a slightly translucent quality. As it grows, the center frequently dips inward or breaks down into a small ulcer, while the edges stay raised and smooth. This combination of a pearly rolled border with a scooped-out center is one of the most recognizable patterns in skin cancer.
Not all basal cell carcinomas look like that, though. Some appear as flat, scar-like patches that are white or yellowish. Others look like small pink or red irritated areas that won’t heal. Because they grow so slowly, people sometimes dismiss them as a pimple or minor wound that keeps coming back in the same spot.
Squamous Cell Carcinoma: Scaly and Firm
Squamous cell carcinoma typically shows up as a firm bump or a flat sore with a rough, scaly crust on top. The bump can be pink, red, brown, or black depending on your skin tone. On the lip, it often starts as a rough, scaly patch that may eventually open into a sore. These spots tend to appear on skin that gets a lot of sun exposure: the face, ears, neck, hands, and forearms.
A key feature is the texture. Where basal cell carcinoma looks smooth and waxy, squamous cell carcinoma feels rough or crusty. It can also develop on old scars or long-standing sores, appearing as a new raised area within damaged skin. Some look wartlike, particularly on the hands or genitals. If a scaly patch bleeds, crusts over, and then returns in the same spot, that pattern is worth getting checked.
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, though it can appear on previously clear skin. The standard framework for spotting it is the ABCDE rule:
- Asymmetry: One half of the spot 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 spot contains more than one shade. You might see brown, tan, and black mixed together, or areas of white, gray, red, pink, or blue.
- Diameter: Most melanomas are larger than 6 millimeters across (roughly the size of a pencil eraser) by the time they’re found, though they can be smaller.
- Evolving: The spot has changed in size, shape, or color over recent weeks or months.
Of all five features, “evolving” is arguably the most important. A mole that has looked the same for years is rarely a concern. A spot that’s growing, darkening, or developing new colors deserves attention regardless of whether it meets every other criterion.
Melanomas That Don’t Look Like Melanoma
Some melanomas produce little or no pigment. These are called amelanotic melanomas, and they’re easy to miss because they don’t match the dark, multicolored image most people associate with the disease. Instead, they appear as a pink or red bump, a flat pinkish patch, or a small skin-colored nodule. They can be mistaken for a pimple, a bug bite, or a minor irritation. If a pink or reddish spot persists for several weeks without an obvious explanation, it’s worth having a dermatologist look at it.
How Skin Cancer Looks on Darker Skin
In people with darker skin tones, skin cancer often appears in areas that get little or no sun. The palms, soles of the feet, fingernails, toenails, inside the mouth, and the genital area are all common locations. A dark spot on the sole of the foot can show the same ABCDE features of melanoma: one half unlike the other, an uneven border, multiple colors.
Melanoma under a nail typically shows up as a dark brown or black line running lengthwise through the nail. It’s sometimes mistaken for a bruise, but unlike a bruise, it doesn’t grow out as the nail grows. The line stays in place or widens over time. This form of melanoma, called acral lentiginous melanoma, is the most common subtype in people with darker skin and is frequently diagnosed late because it appears in places people don’t routinely check.
Merkel Cell Carcinoma: A Rarer Warning
Merkel cell carcinoma is uncommon but aggressive. It typically appears as a firm, painless, reddish or violet bump on sun-exposed skin, most often on the head or neck. It grows fast, sometimes doubling in size within weeks. The typical profile is a person over 50 with fair skin and significant sun exposure, though people with weakened immune systems are also at higher risk. Because the bumps are painless and don’t look obviously threatening, they’re often ignored until they’ve grown substantially. Any rapidly expanding bump that doesn’t hurt is a red flag.
Spots That Look Concerning but Aren’t
Not every unusual spot is cancer. Seborrheic keratoses are extremely common growths that can alarm people because they’re dark, irregularly shaped, and sometimes appear suddenly. The giveaway is their texture: they look waxy and slightly raised, as if a blob of candle wax were stuck onto the skin. They feel rough to the touch but sit on top of the skin rather than growing into it. People often describe them as looking like a scab that never falls off.
The critical difference between a benign growth and a skin cancer is change. Seborrheic keratoses tend to appear and then stay put. Skin cancers evolve. They grow, bleed, crust, change color, or develop irregular features over weeks to months. If you’re unsure whether a spot is harmless, track it. Take a photo with your phone, note the date, and compare it a month later. If anything has shifted, that’s your signal to get a professional opinion.
What to Look For During a Self-Exam
A thorough self-check takes about 10 minutes and should cover your entire body, including areas you wouldn’t expect skin cancer to show up: between your toes, the soles of your feet, your scalp, behind your ears, and your lower back. Use a hand mirror or ask a partner to help with hard-to-see areas. The American Academy of Dermatology recommends recording your spots on a body map so you can compare over time.
The core question at each spot is simple: does this look like my other spots, and has it changed? A mole that’s been the same size and color for a decade is almost certainly fine. A new spot that looks different from everything else on your body, or an old spot that’s started to change, is worth flagging. Men over 50 have an especially elevated risk for melanoma and benefit most from regular self-checks, though skin cancer can develop at any age and on any skin tone.