Skin cancer usually starts as a small, subtle change on the skin that’s easy to dismiss: a pearly bump, a scaly patch that won’t heal, or a mole that starts shifting in color or shape. What it looks like depends entirely on the type, and the three main types, basal cell carcinoma, squamous cell carcinoma, and melanoma, each have distinct early appearances worth knowing.
Basal Cell Carcinoma: The Most Common Type
Basal cell carcinoma is the most frequently diagnosed skin cancer, and it often looks deceptively harmless. The earliest sign is typically a shiny, skin-colored bump with a translucent quality, almost as if you can see slightly through the surface. On lighter skin, this bump looks pearly white or pink. Tiny blood vessels may be visible on or near the surface, though these can be harder to spot on darker skin tones.
Not all basal cell carcinomas look like bumps, though. Some appear as flat, brown, black, or blue lesions with dark spots and a slightly raised, translucent border. Others show up as waxy, scar-like patches. These tend to grow slowly, averaging less than 1 millimeter per month in diameter, which is part of why people overlook them. A spot that barely changes from month to month can sit on your skin for a year or more before it gets attention. Superficial types grow even more slowly, while nodular types expand faster in both width and depth.
Squamous Cell Carcinoma: Rough, Scaly, Persistent
Squamous cell carcinoma tends to have more texture than basal cell. Early on, it often appears as a flat sore with a scaly crust, or a firm bump (called a nodule) that may be pink, red, brown, or black depending on your skin tone. The surface can feel rough or look wartlike.
One hallmark of squamous cell carcinoma is persistence. A sore that opens, maybe crusts over, but never fully heals over the course of two months is a classic warning sign. You might also notice a new raised area forming on an old scar, or a rough, scaly patch on your lip that eventually becomes an open sore. These can also develop inside the mouth or on the genitals, locations people don’t always think to check.
Melanoma and the ABCDE Rule
Melanoma is the most dangerous form of skin cancer, and it typically starts in or near an existing mole, or appears as a new dark spot on the skin. The National Cancer Institute uses the ABCDE rule to describe its early features:
- Asymmetry: one half of the mole doesn’t match the other.
- Border irregularity: the edges are ragged, notched, or blurred, sometimes with pigment spreading into surrounding skin.
- Color that is uneven: a mix of shades including black, brown, tan, white, gray, red, pink, or blue within the same spot.
- Diameter: most melanomas are larger than 6 millimeters (about the size of a pencil eraser), though they can start smaller.
- Evolving: the mole has visibly changed in size, shape, or color over the past few weeks or months.
An estimated 104,960 new melanoma cases will be diagnosed in 2025 in the United States, along with over 107,000 cases of melanoma in situ (the earliest, most treatable stage). Catching it while it’s still flat and hasn’t grown deeper into the skin dramatically improves outcomes.
The Skin Cancers That Don’t Look Dark
One of the most dangerous misconceptions is that skin cancer always involves a dark or pigmented spot. Amelanotic melanoma breaks that rule completely. These melanomas lack the typical brown or black color and instead appear skin-colored, pink, or red. Early lesions can look like a flat pink patch with irregular borders, or a raised pink bump that resembles a harmless mole or even a pimple.
Because they don’t match the usual “dark and suspicious” profile, amelanotic melanomas are frequently missed or misdiagnosed. Dermatologists suggest expanding the standard ABCDE checklist with three additional warning signs: red, raised, and recent change. If you notice a pink or reddish spot that’s slightly raised and appeared recently or is growing, it deserves the same scrutiny as a dark mole.
How Skin Cancer Appears on Darker Skin
Skin cancer can develop on any skin tone, but it tends to show up in different locations on darker skin. Acral lentiginous melanoma, the most common type of melanoma in people of color, develops on the palms of the hands, soles of the feet, or under the nails. It occurs at equal rates across all racial backgrounds but makes up a disproportionate share of melanoma diagnoses in Black, Hispanic, and Asian patients because other types are less common in these groups.
On the palm or sole, it starts as a brown or black discoloration that can look like a bruise or stain. Unlike a bruise, it doesn’t fade. It slowly grows in size over time. Under the nails, it appears as dark vertical streaks running along the nail bed, sometimes mistaken for blood under the nail or a fungal infection. As it progresses, it can cause the nail to crack or break. These locations are rarely checked during casual self-exams, which is one reason melanoma in people of color is more likely to be diagnosed at a later stage.
Precancerous Spots to Watch
Not every early warning sign is cancer yet. Actinic keratoses are rough, scaly patches caused by years of sun exposure, and they’re considered precursors to squamous cell carcinoma. They typically appear on sun-exposed areas like the face, scalp, ears, neck, hands, and forearms.
An actinic keratosis is usually less than an inch across and can be flat or slightly raised. The texture is often the first thing you notice: a rough, sandpapery patch you can feel before you can see it. Colors range from pink to red to brown. Some itch, burn, or occasionally bleed. A small percentage of these spots will progress to squamous cell carcinoma if left untreated, so dermatologists generally recommend treating them early, especially if you have several.
What Matters Most in Self-Checks
The single most reliable warning sign across all types of skin cancer is change. A new spot that appeared in the last few months. A mole that’s shifted in color, size, or shape. A sore that crusts, bleeds, heals partway, then opens again. A patch of rough skin that persists no matter what you do.
When checking your skin, go beyond the places that get obvious sun. Check between your toes, the soles of your feet, your scalp (use a mirror or have someone help), your nail beds, and your ears. Photograph moles you want to track so you have a baseline for comparison. Any spot that is new, changing, or won’t heal within about two months is worth having evaluated by a dermatologist. If a biopsy is needed, it’s typically a quick in-office procedure where a small sample of skin is removed and examined under a microscope to determine whether cancer cells are present.