Sun-caused skin cancer typically appears as a new or changing spot on your skin: a pearly bump, a scaly red patch, a sore that won’t heal, or a mole with uneven color or borders. The exact appearance depends on which type of skin cancer has developed, and the three main types look quite different from one another. Knowing what to look for on each part of your body makes it far easier to catch something early.
Basal Cell Carcinoma: The Most Common Type
Basal cell carcinoma is the skin cancer you’re most likely to develop from sun exposure, and it has a distinctive look. The classic version is a small, dome-shaped bump with a pearly or waxy sheen. If you look closely, you can often see tiny blood vessels running across its surface, like thin red threads branching outward. The bump may look almost translucent in certain lighting.
As the growth enlarges, a central depression often forms, and the surface can crust over or bleed. Some people describe it as a pimple that never fully heals. Other forms of basal cell carcinoma look different: a flat, flesh-colored or slightly pink patch that resembles a scar, or a white, waxy area without a clear border. These less obvious versions are easy to overlook because they don’t match the mental image most people have of “cancer.”
Squamous Cell Carcinoma: Rough, Scaly, Persistent
Squamous cell carcinoma tends to look rougher and more textured than basal cell carcinoma. The hallmarks are a firm, red bump or a flat, scaly patch that may be about an inch across. The surface often feels crusty, like a scab, and it can bleed if you scratch or pick at it. Some squamous cell carcinomas look like warts with a raised, irregular surface.
The key warning sign is a wound or sore that won’t heal, or one that seems to heal and then comes back in the same spot. The area may feel dry, itchy, or tender. Before squamous cell carcinoma fully develops, it often starts as a precancerous patch called actinic keratosis: a rough, sandpaper-textured spot, usually less than an inch wide, that can be pink, red, or brown. These patches crop up on skin that gets the most sun and sometimes develop a hard, wartlike surface over time. Not every actinic keratosis becomes cancer, but they signal enough sun damage that your skin deserves close monitoring.
Melanoma: The One to Watch Most Carefully
Melanoma is less common than the other two types but far more dangerous. It usually appears as an irregular dark brown or black splotch on the skin, though it can arise inside an existing mole that starts to change. Dermatologists use a set of five visual criteria, known as the ABCDE rule, to help identify it:
- Asymmetry: One half of the spot doesn’t match the other half.
- Border: The edges are ragged, notched, or blurred rather than smooth and round.
- Color: Multiple colors appear within the same spot, such as shades of brown, black, red, white, or blue.
- Diameter: The spot is larger than 6 millimeters across, roughly the size of a pencil eraser.
- Evolving: The spot is changing in size, shape, color, or texture, or it starts to itch or bleed.
Any single one of these features is worth getting checked. You don’t need all five to be present.
Melanoma That Doesn’t Look Like Melanoma
One of the trickiest forms is amelanotic melanoma, a rare subtype that lacks the dark pigment most people associate with the disease. Instead of appearing as a dark splotch, it’s usually pink, reddish, or light brown. Sometimes it has almost no color at all. Because it doesn’t match the “poster child” image of melanoma, it’s harder to recognize and often gets mistaken for a minor irritation or a harmless bump. If you notice a new pinkish spot that looks slightly different from the surrounding skin, is growing, or doesn’t resolve on its own, it’s worth having a professional look at it.
Where Sun-Related Skin Cancer Shows Up
Skin cancer from sun exposure tends to appear on the areas of your body that see the most ultraviolet light, but the pattern isn’t identical for everyone. People who work outdoors have significantly higher rates of skin cancer on the head and neck. One large study found that outdoor workers were more than 2.5 times as likely to develop melanoma on the head and neck compared to people who work indoors. The trunk (chest and back) is also a common site, likely because of intermittent intense exposure during activities like yard work, sports, or weekends at the beach.
For basal cell and squamous cell carcinomas, the face is the single most common location, especially the nose, ears, lips, and the area around the eyes. The backs of the hands, forearms, and the scalp (particularly in people with thinning hair) are frequent sites too. Don’t forget the back of the neck and the tops of the ears, two spots that are easy to miss when applying sunscreen and easy to overlook when checking your skin.
Harmless Spots vs. Suspicious Ones
As you accumulate sun exposure over the years, your skin develops all sorts of marks: freckles, age spots, and raised brown patches called seborrheic keratoses. These last ones are extremely common after age 50 and can look alarming. They’re often dark brown, slightly raised, and have a stuck-on, waxy appearance. Even dermatologists sometimes find them tricky to distinguish from melanoma at first glance.
A few practical differences help. Seborrheic keratoses tend to have a uniform, bumpy texture across their entire surface, almost like the surface of a cauliflower. They look like they’ve been pasted onto the skin rather than growing from within it. Melanoma, by contrast, typically has uneven coloring, with patches of different shades bleeding into one another, and its borders fade irregularly into the surrounding skin. The single most useful clue is change: benign spots generally look the same month after month. A spot that’s growing, darkening, developing new colors, or starting to bleed deserves professional evaluation.
How to Check Your Own Skin
A thorough self-exam takes about 10 minutes and works best in a well-lit room with a full-length mirror and a hand mirror. Start by facing the full-length mirror and scanning your entire front, then turn and check your back. Raise your arms and inspect both sides, including the often-neglected backs of your upper arms. Bend your elbows to see your forearms, and check the tops and palms of your hands.
Sit down to examine your legs, front and back, then your feet, including the soles and the spaces between your toes. Use the hand mirror to check your scalp section by section (a comb helps part the hair), the back of your neck, your buttocks, and your genital area. Having someone you trust help with hard-to-see spots makes a real difference. Do this once a month, and you’ll start to build a mental map of your skin’s normal landscape, which makes anything new or changing much easier to spot.