Skin cancer doesn’t have one single look. It can appear as a pearly bump, a scaly red patch, a dark streak under a nail, or even a pink spot that barely stands out from the surrounding skin. The type of skin cancer determines what you’ll see, and some forms look nothing like what most people expect.
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 shows up as a shiny, translucent bump with a pearly white or pink quality. You can almost see through the surface. On brown and Black skin, the same bump often looks brown or glossy black instead.
Tiny blood vessels are sometimes visible on or near the bump, giving it a slightly web-like appearance, though this is harder to spot on darker skin tones. The bump may bleed, scab over, then seem to heal before opening up again. That cycle of bleeding and scabbing without fully resolving is a hallmark worth paying attention to.
Not all basal cell carcinomas look like bumps. Some appear as flat, scaly patches with or without a raised edge. Others resemble a white, waxy, scar-like area with no clear border. A less common form shows up as a brown, black, or blue lesion with dark spots and a slightly raised, translucent rim around it.
Squamous Cell Carcinoma: Scaly and Persistent
Squamous cell carcinoma is the second most common type. It often looks like a firm nodule on the skin that can be pink, red, brown, or black depending on your skin tone. Sometimes it’s the same color as the surrounding skin, which makes it easy to dismiss.
Another common presentation is a flat sore topped with a scaly, crusty surface. It can also appear as a rough, scaly patch on the lip that eventually becomes an open sore, or as a new raised area developing on top of an old scar. Some squamous cell carcinomas look wart-like, which leads people to ignore them. The key distinguishing feature is persistence: a sore or scab that hasn’t healed in about two months, or a scaly patch that simply won’t go away, warrants a closer look.
Melanoma: The ABCDE Checklist
Melanoma is less common than the other two but far more dangerous. The National Cancer Institute uses the “ABCDE” rule to describe what early melanoma looks like:
- Asymmetry: One half of the spot doesn’t match the other half.
- Border: The edges are ragged, notched, or blurred rather than smooth. Pigment may spread into the surrounding skin.
- Color: Multiple shades are present in a single spot. You might see black, brown, and tan mixed together, or areas of white, gray, red, pink, or blue.
- Diameter: Most melanomas are larger than 6 millimeters wide (about the size of a pencil eraser), though they can be smaller.
- Evolving: The mole has changed in size, shape, or color over the past few weeks or months.
Not every melanoma checks all five boxes. A mole that meets even one or two of these criteria, especially if it’s evolving, is worth having examined.
The Ugly Duckling Sign
If you have many freckles or moles, the ABCDE rule can feel overwhelming because plenty of normal moles are slightly irregular. A simpler approach is the “ugly duckling” sign: look for the one spot that doesn’t match the rest. Maybe it’s scabbed over while the others aren’t, or it’s more raised, or it’s grown while everything else stayed the same. That outlier, the mole that stands apart from your personal pattern, is the one to flag.
What Skin Cancer Looks Like on Darker Skin
Most educational images of skin cancer show it on light skin, which creates a dangerous blind spot. Melanoma on darker skin tones most commonly appears in places that get little sun exposure: the palms of the hands, soles of the feet, and under the nails. This form, called acral lentiginous melanoma, occurs equally across all races and backgrounds, and it accounts for the majority of melanoma diagnoses in people of color.
On the sole of the foot or palm of the hand, it starts as a black or brown discoloration that may look like a bruise or stain. Unlike a bruise, it doesn’t fade. Over time it grows in size. Under a fingernail or toenail, it usually appears as a dark vertical streak running from the bottom of the nail to the top. As it progresses, the streak widens (often starting at the base of the nail first), and the nail may crack or break. If the dark pigment spreads to the skin surrounding the nail, that’s called the Hutchinson sign, and it’s a particularly important warning.
These spots are sometimes mistaken for bruises, fungal infections, or blood under the nail, which can delay diagnosis significantly.
Skin Cancer That Doesn’t Look Dark
About 5 percent of melanomas are amelanotic, meaning they lack the dark pigmentation most people associate with the disease. Instead, they appear as a pink or red spot on the skin. Because they don’t look like the textbook image of melanoma, they’re frequently overlooked or confused with benign skin conditions like a rash or pimple. This often leads to a later-stage diagnosis compared to the more recognizable dark-pigmented melanomas.
Any subtype of melanoma can present this way. So while checking for dark, irregular moles is important, a pink or flesh-colored spot that’s growing, bleeding, or simply not going away deserves the same level of attention.
Pre-Cancerous Spots to Watch
Actinic keratoses are rough, dry, scaly patches of skin that haven’t become cancer yet but can progress to squamous cell carcinoma over time. They’re usually less than an inch across and feel like sandpaper when you run your finger over them. Color ranges from pink to red to brown, and some develop a hard, wart-like surface. These typically appear on areas with years of sun exposure: the face, scalp, ears, forearms, and backs of the hands.
Fast-Growing Bumps
Merkel cell carcinoma is rare but aggressive. It shows up as a firm bump that grows quickly, sometimes noticeably changing over just a few weeks. The bump can look pink, purple, red-brown, or skin-colored. Because it often resembles a cyst or insect bite and doesn’t match what most people picture when they think of skin cancer, it’s easy to dismiss. Rapid growth is the key distinguishing feature. A bump that appeared recently and is getting bigger fast is not typical of benign skin conditions.
What to Actually Look For
Across all types of skin cancer, the common thread is change. A new spot that wasn’t there before. A mole that’s shifted in color or size. A sore that bleeds, scabs, and never fully heals. A bump that’s growing week over week. Skin cancer rarely hurts in its early stages, so waiting for pain is not a reliable strategy.
Get in the habit of checking your skin regularly enough that you’d notice something new or different. Pay attention to areas you might skip: the soles of your feet, between your toes, your scalp, and under your nails. The spots people overlook are often the ones where a diagnosis comes late.