Skin cancer can look like a pearly bump, a scaly red patch, a dark irregular mole, or even a sore that simply won’t heal. The appearance varies significantly depending on the type, and no single description covers all cases. Knowing what to look for across the three major types, plus a few less common forms, gives you the best chance of catching something early.
Basal Cell Carcinoma
Basal cell carcinoma is the most common skin cancer, and it comes in several forms that look quite different from one another.
The most frequent version, nodular basal cell carcinoma, accounts for over 60% of cases. It typically appears as a round, flesh-colored or pearly bump with tiny visible blood vessels running across its surface. As it grows, the center often breaks down into an open sore while the edges stay raised and shiny. That raised, pearly border is one of the most recognizable features of this cancer.
Superficial basal cell carcinoma looks nothing like the nodular type. It shows up mostly on the upper back or shoulders as a flat, reddish patch with a whitish scale. It can resemble eczema or a patch of dry skin, which is why people often ignore it. It grows slowly and tends to stay near the skin’s surface.
The hardest form to spot is morpheaform basal cell carcinoma, which looks like a flat, waxy, white or yellowish patch that resembles scar tissue. It rarely bleeds or crusts over, so it can go unnoticed for a long time. This type accounts for about 10% of basal cell carcinomas.
Squamous Cell Carcinoma
Squamous cell carcinoma tends to look rougher and more aggressive than basal cell. Common appearances include a firm bump or nodule on the skin (which can be pink, red, brown, or skin-colored), a flat sore topped with a scaly crust, or a rough scaly patch on the lip that may develop into an open sore. It can also appear as a new raised area on top of an old scar, or as a wartlike growth near the genitals or anus.
A key warning sign is any sore or scab that hasn’t healed within about two months. Unlike a normal wound, squamous cell carcinoma persists. Left untreated, it can grow large and spread to other parts of the body. These cancers also show up inside the mouth as sores or rough patches, and on nail beds as thick, red, scaly areas.
Melanoma
Melanoma is less common than basal or squamous cell carcinoma but far more dangerous. The standard way to evaluate a suspicious mole is the ABCDE rule developed by the National Cancer Institute:
- Asymmetry: One half of the mole doesn’t match the other.
- Border: The edges are ragged, notched, or blurred rather than smooth. Pigment may spread into the surrounding skin.
- Color: The mole contains uneven shades of black, brown, or tan. You may also see patches of white, gray, red, pink, or blue within the same spot.
- Diameter: Most melanomas are larger than 6 millimeters across (roughly the size of a pencil eraser), though they can start smaller.
- Evolving: The mole has changed in size, shape, or color over the past few weeks or months.
Another useful concept is the “ugly duckling” sign. Most of your moles tend to look similar to each other. If one mole stands out as clearly different from all the others, that outlier deserves a closer look.
Early detection makes an enormous difference with melanoma. When caught while still confined to its original site, the five-year survival rate is essentially 100%. Once it spreads to nearby lymph nodes, that drops to 76%. If it reaches distant organs, survival falls to 34%.
How Skin Cancer Looks on Darker Skin
Skin cancer presents differently in people with darker skin tones, and these differences contribute to later diagnoses. The most common form of melanoma in people with dark skin is acral lentiginous melanoma, which doesn’t appear in the typical sun-exposed areas. Instead, it develops on the palms of the hands, the soles of the feet, and under fingernails or toenails. It can look like a dark patch on your palm or sole, or a dark band running lengthwise under a nail.
Because these locations aren’t usually associated with skin cancer, they’re easy to miss. Checking your palms, the bottoms of your feet, and your nail beds should be part of any regular skin check, especially if you have darker skin.
Places Skin Cancer Hides
Not all skin cancers appear on sun-exposed areas. They can develop between your toes, on your scalp, under your nails, on the soles of your feet, and near the genitals. Squamous cell carcinoma in particular can appear in the genital area, especially in people who have been exposed to HPV. Cancers that form in overlooked areas like between the toes tend to be diagnosed later and can grow deeper before anyone notices them.
Precancerous Spots to Watch
Actinic keratoses are rough, dry, scaly patches that can develop into squamous cell carcinoma over time. They’re usually less than an inch across and feel like sandpaper when you run your finger over them. Colors range from pink to red to brown, and some develop a hard, wartlike surface. They show up on skin that’s had years of sun exposure: the face, ears, forearms, and backs of hands.
It’s genuinely difficult to tell a harmless rough patch from one that’s becoming cancerous just by looking at it. Any scaly spot that persists, grows, or bleeds is worth getting checked.
Merkel Cell Carcinoma
This is rare but worth knowing about because it grows very fast. Merkel cell carcinoma appears as a small, firm, painless bump on the skin. It can be red or scaly, round or asymmetrical, and is often mistaken for a pimple, wart, or cyst. What sets it apart is how quickly it changes. If you have a bump that looks unremarkable but is growing noticeably over days to weeks, that rapid growth is itself a warning sign.
What to Look for During a Self-Check
No major medical organization currently recommends a specific schedule for professional skin cancer screenings in people without risk factors. That puts more responsibility on you to notice changes on your own skin. The core principle is simple: you’re looking for anything new, anything that has changed, and anything that looks different from the spots around it.
Specifically, watch for a sore that won’t heal, a new bump or nodule, a mole that’s changing shape or color, a dark streak under a nail, a rough patch that persists for months, or a shiny pearly bump. Check your whole body, including your scalp, between your toes, and under your nails. If you have a personal or family history of skin cancer, regular visits to a dermatologist are worth prioritizing regardless of screening guidelines.