Skin cancer symptoms vary by type, but most share one thing in common: a visible change on the skin that doesn’t go away. That change might be a new bump, a sore that won’t heal, a mole that shifts in color or shape, or a rough patch that persists for weeks. Knowing what each type looks like gives you a real advantage, because skin cancers caught early are almost always treatable.
Basal Cell Carcinoma Symptoms
Basal cell carcinoma is the most common form of skin cancer, and it shows up most often on the face and neck, areas that get the most sun over a lifetime. On lighter skin, it typically looks like a slightly transparent, pearly bump that’s skin-colored or pink. On brown and Black skin, it often appears as a brown or glossy black bump with a rolled border. In both cases, tiny blood vessels may be visible on the surface, and the bump can bleed and scab over repeatedly.
Not all basal cell carcinomas look like bumps, though. Some appear as flat, scaly patches with or without a raised edge. Others resemble a white, waxy scar without a clearly defined border, which makes them easy to overlook. You might also see a lesion that’s brown, black, or blue with dark spots and a slightly raised, translucent edge. The key signal is persistence: these spots don’t heal on their own and may bleed, crust over, and then bleed again over weeks or months.
Squamous Cell Carcinoma Symptoms
Squamous cell carcinoma is the second most common skin cancer. Its hallmark is a firm bump (a nodule) on the skin that can look pink, red, black, or brown depending on your skin tone. It may also appear as a flat sore with a scaly crust, a rough or scaly patch on the lip that becomes an open sore, or a raised area developing on top of an old scar.
This type can also show up inside the mouth as a sore or rough patch, or as a wartlike growth on the genitals or anus. A practical rule: if you have a sore or scab that hasn’t healed in about two months, or a flat patch of scaly skin that won’t go away, that’s worth getting examined.
Melanoma and the ABCDE Rule
Melanoma is less common than basal or squamous cell carcinoma, but it’s the most dangerous because it can spread to other organs. The classic way to spot a suspicious mole is the ABCDE framework:
- Asymmetry: One half of the mole doesn’t match the other.
- Border: The edges are ragged, notched, or blurred, and pigment may spread into surrounding skin.
- Color: Instead of a single uniform shade, you see a mix of black, brown, tan, white, gray, red, pink, or blue within the same spot.
- Diameter: Most melanomas are larger than 6 millimeters wide (roughly the size of a pencil eraser), though they can be smaller.
- Evolving: The mole is changing in size, shape, or color over time.
There’s also a concept called the “ugly duckling” sign. If you have lots of freckles or moles and one of them looks noticeably different from the rest, maybe more raised, scabbed over, or just visually “off,” that outlier deserves attention. It refers to a mole that doesn’t match its neighbors, and it can be a warning sign even when the ABCDE criteria aren’t all clearly present.
Melanoma That Doesn’t Look Like Melanoma
About 5 percent of melanomas are amelanotic, meaning they lack the dark pigment most people associate with skin cancer. Instead, they appear as a pink or red spot on the skin. Because they’re easy to confuse with a pimple, rash, or other harmless mark, amelanotic melanomas are often diagnosed at a later stage than pigmented ones. If you notice a persistent pink or reddish spot that doesn’t heal or continues to grow, don’t dismiss it just because it isn’t dark.
Symptoms on Darker Skin Tones
Skin cancer in people with darker skin often appears in places that get little sun. The most common form of melanoma in people with dark skin is acral lentiginous melanoma, which develops on the palms of the hands, the soles of the feet, and on fingers, toes, and nail beds. It can look like a dark patch on your palm or the bottom of your foot, or a dark band running under a fingernail or toenail.
A dark streak under the nail is especially important to watch. If that band begins to widen or spread into the surrounding skin, it needs medical evaluation. These locations are easy to miss during casual skin checks, which is why skin cancer in darker skin tones is often caught later than it should be.
Precancerous Spots to Watch
Not every concerning skin change is cancer yet. Actinic keratoses are rough, dry, scaly patches that develop from years of sun exposure. They’re usually less than an inch across and may feel like sandpaper when you run a finger over them. Some are flat, others are slightly raised, and some develop a hard, wartlike surface. These spots are considered precancerous. Left untreated, a small percentage can progress to squamous cell carcinoma, so treating them early eliminates that risk entirely.
Merkel Cell Carcinoma
Merkel cell carcinoma is rare but aggressive. It typically appears as a painless bump on the skin that grows quickly. The bump may look pink, purple, red-brown, or skin-colored, and its two sides often don’t match (similar to the asymmetry seen in melanoma). What sets Merkel cell carcinoma apart is its speed. It tends to grow and spread to other parts of the body faster than other skin cancers. Any rapidly enlarging, painless bump, especially on sun-exposed areas in older adults, warrants a prompt evaluation.
What Happens if a Spot Looks Suspicious
If you or a doctor notices a spot that could be skin cancer, the next step is a biopsy, where a small sample of skin is removed and examined under a microscope. There are a few types. A shave biopsy removes a thin surface layer of skin and usually doesn’t need stitches. A punch biopsy uses a small circular tool to take a deeper, round sample. An excisional biopsy removes a larger piece of skin with a scalpel. Both punch and excisional biopsies typically require a couple of stitches. Your doctor chooses the method based on the size and location of the spot. The procedure is done with local numbing and takes only minutes.
How to Check Your Own Skin
No major medical organization in the U.S. currently recommends routine skin cancer screening exams for the general population. The U.S. Preventive Services Task Force says there isn’t enough evidence to determine whether regular visual exams by a clinician benefit people who have no symptoms or family history of skin cancer. That doesn’t mean screening is harmful. It means the decision is best made on an individual basis, factoring in your sun exposure history, skin type, and personal risk.
What you can do on your own is check your skin thoroughly once a month. Use a full-length mirror and a hand mirror to examine your back, scalp, and the backs of your legs. Pay attention to the palms of your hands, the soles of your feet, between your toes, and under your nails. You’re looking for anything new, anything changing, and anything that stands out from its surroundings. If a spot is growing, bleeding, crusting, or simply looks different from every other mark on your body, that’s the spot to have a professional examine.