Skin cancer can look like a pearly bump, a scaly red patch, a sore that won’t heal, or a mole that’s changing shape or color. 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 with each type makes it much easier to catch something early.
Basal Cell Carcinoma: The Most Common Type
Basal cell carcinoma accounts for the majority of skin cancers and tends to grow slowly. On lighter skin, it typically appears as a shiny, somewhat translucent bump with a pearly white or pink surface. You might notice tiny blood vessels running through it. On brown and Black skin, the same bump often looks brown or glossy black, and those blood vessels can be harder to spot.
Not all basal cell carcinomas look like bumps, though. They can also show up as:
- A flat, scaly patch with or without a raised edge
- A brown, black, or blue spot with a slightly raised, translucent border
- A white, waxy, scar-like area without a clear border
The bump may bleed, scab over, and then bleed again. This cycle of bleeding and crusting that never fully resolves is one of the most recognizable warning signs. If you have a small wound on sun-exposed skin that keeps reopening over weeks, that’s worth getting checked.
Squamous Cell Carcinoma: Rough, Scaly Patches
Squamous cell carcinoma is the second most common skin cancer, and it often starts in areas that get regular sun exposure: the face, ears, neck, hands, and forearms. It typically looks like a flat sore with a scaly, crusty surface, or a firm, rough bump that may bleed if scratched or bumped. On the lips, it can appear as a persistent scaly patch that eventually becomes an open sore.
These growths can also resemble warts, particularly on the genitals or around the anus. What sets them apart from harmless skin roughness is that they don’t resolve on their own, they may grow over weeks to months, and they sometimes feel tender or painful to the touch.
Precancerous Rough Spots
Many squamous cell carcinomas start as precancerous patches called actinic keratoses. These begin as small, reddish spots you might feel before you see them, like fine sandpaper on your skin. In early stages, running your fingers over the area is actually more reliable than looking at it. As they progress, the scaling and redness become more obvious, and the rough texture thickens. When an actinic keratosis develops a noticeably thick crust, deeper redness, or starts growing outward, those are signs it may be transitioning toward squamous cell carcinoma.
Melanoma: The Most Dangerous Type
Melanoma is less common than the other two types but far more serious because it can spread to other parts of the body. It usually appears as a new or changing mole, and the ABCDE rule is the standard way to evaluate whether a mole looks suspicious:
- Asymmetry: one half of the mole doesn’t match the other
- Border: the edges are ragged, notched, or blurred, sometimes with pigment spreading into surrounding skin
- Color: the mole contains multiple shades of brown, black, or tan, possibly with areas of white, gray, red, pink, or blue mixed in
- Diameter: the spot is larger than 6 millimeters (roughly the size of a pencil eraser), though melanomas can be smaller
- Evolving: the mole has changed in size, shape, or color over the past few weeks or months
A normal mole is typically one uniform color, has smooth borders, and stays the same over time. Melanoma breaks those rules. Any mole that looks different from your other moles, sometimes called the “ugly duckling” sign, deserves attention even if it doesn’t check every box above.
Nodular Melanoma Grows Fast
One subtype worth knowing about is nodular melanoma, which doesn’t always follow the ABCDE pattern. Instead of spreading outward like a flat mole, it grows upward as a raised, firm lump. It can be dark brown, black, or even skin-colored or reddish. The key warning signs are that it’s elevated, firm to the touch, and growing noticeably over days to weeks. Because it doesn’t look like a typical changing mole, nodular melanoma is often caught later than other types.
What Skin Cancer Looks Like on Darker Skin
Skin cancer on darker skin tones doesn’t always appear in the places people expect. While sun-exposed areas are the most common sites overall, people with darker skin are more likely to develop a subtype called acral melanoma, which shows up on the palms of the hands, the soles of the feet, and under the fingernails or toenails. These are areas that get little to no sun exposure, which is part of why they’re easy to overlook.
Under a nail, melanoma can appear as a dark streak or band running lengthwise. On the palms or soles, it may look like an irregularly shaped dark patch. People with darker skin who develop acral melanoma frequently have thicker, more advanced tumors at the time of diagnosis, which significantly affects outcomes. Checking areas like your nail beds, the spaces between your toes, and the soles of your feet is especially important if you have brown or Black skin.
Physical Symptoms Beyond Appearance
Skin cancer isn’t always just something you see. A sore that won’t heal is one of the most common signs across all three types. Beyond that, you might notice itching around a growth, or tenderness and pain in the area. These sensations can occur even when the spot itself looks relatively minor. Persistent itching around a mole or patch that previously didn’t itch is worth paying attention to.
Recurring bleeding is another red flag. A spot that bleeds, seems to heal, and then bleeds again without any real injury to the area is behaving differently from a normal wound, and that pattern alone is a reason to have it examined.
Rare Types That Don’t Look Typical
Merkel cell carcinoma is uncommon but aggressive. It appears as a rapidly growing, painless, reddish-blue bump on the skin, usually on areas that get sun exposure. It develops over weeks to months and is most common in people over 50 with fair skin or weakened immune systems. Because it doesn’t look obviously alarming and causes no pain, it’s often mistaken for a cyst or other harmless growth. Any firm bump on sun-exposed skin that’s growing quickly and wasn’t there a few months ago warrants a closer look.
How to Check Your Own Skin
Monthly self-exams are the most practical way to catch changes early. You need a well-lit room, a full-length mirror, and a hand mirror. Start by examining your entire front and back in the full-length mirror, then raise your arms and check both sides. Use the hand mirror to see your scalp, the back of your neck, your back, and your buttocks. Don’t skip your palms, the spaces between your fingers and toes, your toenails, and the soles of your feet.
The goal isn’t to diagnose yourself. It’s to notice change. When you check regularly, you learn what’s normal for your skin, and anything new or different becomes obvious. A mole that’s darker than it used to be, a rough patch that appeared last month and hasn’t gone away, a bump that bleeds when you towel off after a shower: those are the kinds of changes that monthly checks help you catch before they become harder to treat.