Skin cancer usually first appears as a small change you might easily dismiss: a shiny bump, a scaly patch, a sore that won’t heal, or a mole that starts looking different from the others. The specific appearance depends on the type of skin cancer, but all three major types, basal cell carcinoma, squamous cell carcinoma, and melanoma, leave visible clues on the skin’s surface well before they become dangerous. Knowing what to look for makes a real difference, since early-stage skin cancer is almost always treatable.
Basal Cell Carcinoma: The Most Common Type
Basal cell carcinoma is the skin cancer most people will encounter, and it often looks surprisingly subtle. The earliest sign is typically a small, shiny bump that appears translucent, almost like you can see slightly through the surface. On lighter skin, this bump looks pearly white or pink. On brown or Black skin, it tends to appear brown or glossy black. You might notice tiny blood vessels running across it, though these can be harder to spot on darker skin tones.
Not all basal cell carcinomas start as bumps. Some appear as flat, scaly patches with a slightly raised edge that slowly expand over time. Others look like a white, waxy area that resembles a scar, with no clear border. One of the most telling features is a sore that bleeds, scabs over, and then reopens. If you have a spot that cycles through bleeding and healing without ever fully resolving, that pattern alone is worth getting checked.
Squamous Cell Carcinoma: Rough, Scaly, Persistent
Squamous cell carcinoma tends to look rougher and more textured than basal cell. Early on, it often shows up as a firm bump (called a nodule) that can be skin-colored, pink, red, brown, or black depending on your complexion. It can also appear as a flat sore topped with a scaly, crusty surface.
A few patterns are especially common. A rough, scaly patch on your lip that eventually becomes an open sore. A new raised area developing on an old scar. A wart-like growth on the genitals or anus. Sores or rough patches inside the mouth also count. The texture is the giveaway here: these spots feel gritty or sandpapery, and they don’t resolve on their own the way a normal scrape or dry patch would.
Before squamous cell carcinoma fully develops, you may first notice a precancerous spot called an actinic keratosis. These are small, rough patches, often with a pink base and a dry, scaly top, that show up on sun-exposed areas like the nose, forehead, ears, and backs of the hands. Not all of them turn into cancer, but they signal significant sun damage and deserve monitoring.
Melanoma: The ABCDE Guide
Melanoma is the least common of the three major types but the most dangerous. An estimated 112,000 new cases will be diagnosed in the U.S. in 2026, with roughly 8,500 deaths. It typically starts in or near a mole, and dermatologists use a five-letter framework to describe the warning signs:
- Asymmetry: One half of the mole doesn’t match the other. Normal moles are roughly symmetrical.
- Border: The edges are ragged, notched, or blurred rather than smooth. Pigment may spread into the surrounding skin.
- Color: Instead of one uniform shade, you see a mix of brown, tan, black, or even areas of white, gray, red, pink, or blue within the same spot.
- Diameter: Most melanomas are larger than 6 millimeters across (about the size of a pencil eraser), though they can be smaller.
- Evolving: The mole has changed in size, shape, or color over recent weeks or months. Any visible change is the single most important signal.
You don’t need all five features to be present. A mole that meets even one or two of these criteria, especially “evolving,” is worth showing to a dermatologist.
Skin Cancer That Doesn’t Look Like a Dark Spot
One of the most overlooked forms is amelanotic melanoma, a melanoma that produces little or no pigment. Instead of a dark mole, it appears as a pink, red, or skin-colored bump or plaque. It accounts for roughly 2 to 8 percent of all melanomas, and because it doesn’t match what most people picture when they think “skin cancer,” it’s frequently mistaken for a pimple, a patch of dermatitis, or even a wart. If you have a pink or reddish spot that persists for more than a few weeks, doesn’t respond to typical treatments, or slowly grows, take it seriously.
How Skin Cancer Looks on Darker Skin
Skin cancer can develop in people of any skin tone, but it often shows up in different locations on darker skin. A subtype called acral lentiginous melanoma occurs on the palms, soles, and nail beds, areas that receive little sun exposure. It disproportionately affects Black, Hispanic, and Asian individuals, and it’s frequently diagnosed at a more advanced stage because these locations are easy to overlook.
On the skin, acral melanoma appears as an irregularly pigmented dark patch on the palm or sole. Under a nail, it shows up as a dark streak running the length of the nail (a condition called melanonychia). A streak that widens over time, involves more than one nail color, or extends onto the skin around the nail is a red flag. During self-exams, checking the soles of your feet and your fingernails and toenails is just as important as scanning your arms and torso.
The “Ugly Duckling” Test
Beyond the ABCDE criteria, there’s a simpler instinct worth trusting: look for the outlier. Most of your moles share a general family resemblance in color, size, and shape. A spot that looks noticeably different from all the others, the “ugly duckling,” deserves closer attention even if it doesn’t clearly meet any specific checklist. This approach is especially useful for catching amelanotic melanomas and other atypical presentations that don’t follow the classic dark-mole pattern.
How to Check Your Own Skin
The American Academy of Dermatology recommends a systematic head-to-toe check that takes only about 10 minutes. Start by standing in front of a full-length mirror and looking at your body from the front and back, then raise your arms and examine both sides. Bend your elbows and carefully inspect your forearms, underarms, fingernails, and palms.
Next, check the backs of your legs and feet, the spaces between your toes, your toenails, and your soles. Use a hand mirror to examine the back of your neck and scalp, parting your hair as you go. Finish by checking your back and buttocks with the hand mirror. The goal isn’t to diagnose anything yourself. It’s to notice something new, something changing, or something that stands out from the rest of your skin so you can bring it to a professional while it’s still early.
Doing this once a month gives you a reliable baseline. When you know what your skin normally looks like, a new or evolving spot is much easier to catch.