Early skin cancer typically appears as a small, unusual spot that doesn’t heal, keeps changing, or simply looks different from everything else on your skin. The tricky part is that it rarely looks alarming at first. Most early skin cancers are subtle: a pearly bump, a scaly patch, a sore that scabs over and reopens, or a mole that slowly shifts in shape or color. What it looks like depends on the type of skin cancer, and there are three main types to know.
Basal Cell Carcinoma: The Most Common Type
Basal cell carcinoma accounts for the majority of skin cancers and tends to grow slowly. In its earliest stage, it often appears as a small, shiny bump that looks slightly translucent, almost like a tiny pearl sitting on the skin. On lighter skin, this bump is usually pinkish or skin-colored. On darker skin, it tends to look brown or glossy black. If you look closely, you may notice tiny blood vessels running across or around the bump, though these can be harder to spot on darker skin tones.
Not all basal cell carcinomas start as bumps. Some begin as a flat, scaly patch with a slightly raised edge that slowly expands over time. Others look like a white, waxy, scar-like area with no clear border, which can be especially easy to dismiss because it doesn’t look like what most people picture when they think of cancer. A hallmark behavior of early basal cell carcinoma is a spot that bleeds, scabs over, appears to heal, then opens up again. This cycle of bleeding and scabbing that never fully resolves is one of the strongest early warning signs.
Squamous Cell Carcinoma: Rough and Persistent
Squamous cell carcinoma often starts as a firm bump or a flat sore topped with a crusty, scaly surface. The bump can be pink, red, brown, or black depending on your skin tone, and it sometimes looks like a wart. On the lip, it may begin as a rough, scaly patch that eventually cracks into an open sore. It can also develop inside the mouth as a sore or rough patch that won’t go away.
One distinguishing feature is that squamous cell carcinoma frequently arises in a spot that already has sun damage or an old scar. If you notice a new raised area forming on top of an existing scar or a long-standing sore, that’s worth attention. The general rule: a sore or scab that hasn’t healed within about two weeks should be evaluated.
The Precancerous Stage
Before squamous cell carcinoma fully develops, it often starts as a precancerous lesion called actinic keratosis. These are small, pinkish spots with a rough, gritty texture, often described as feeling like sandpaper. In fact, very small ones are easier to feel than see. They show up on sun-exposed areas like the face, scalp, ears, and backs of the hands. Actinic keratoses on their own are small, flat, and not painful. If one starts growing quickly, thickening into a raised bump, bleeding, or forming a sore that won’t heal, those are signs it may be progressing into actual skin cancer.
Melanoma: The ABCDE Rule
Melanoma is less common than the other two types but far more dangerous, and catching it early makes an enormous difference in outcomes. It usually starts in or near an existing mole, though it can also appear as an entirely new spot. The National Cancer Institute describes five features to watch for, known as the ABCDE rule:
- Asymmetry: One half of the mole doesn’t match the other half.
- Border: The edges are ragged, notched, or blurred rather than smooth and round. Pigment may bleed into surrounding skin.
- Color: Multiple shades are present, mixing brown, black, and tan with patches of white, gray, red, pink, or blue.
- Diameter: Most melanomas are larger than 6 millimeters (roughly the size of a pencil eraser), though they can start smaller.
- Evolving: The spot has visibly changed over the past few weeks or months in size, shape, or color.
You don’t need all five features to be present. Any one of them, especially “evolving,” is enough to warrant a closer look.
The Ugly Duckling Sign
If you have many moles or freckles, the ABCDE rule can feel overwhelming because plenty of normal moles look a little irregular. A simpler approach is the “ugly duckling” sign: look for the one spot that doesn’t match the rest. Most of your moles will share a general family resemblance in color, size, and shape. The one that stands out, whether it’s darker, more raised, scabbed over, or just looks “off” compared to its neighbors, is the one to get checked. This method is especially useful for people with dozens of moles who can’t easily evaluate each one individually.
When Skin Cancer Doesn’t Look Dark
Most people associate skin cancer with dark or pigmented spots, but some melanomas produce little or no pigment at all. These are called amelanotic melanomas, and they can appear pink, red, or completely skin-colored. Early lesions may look like a flat, pinkish patch with irregular edges or a small raised bump that resembles a pimple or insect bite. Because they lack the classic dark coloring, they’re easily mistaken for other common skin conditions.
The standard ABCDE criteria often miss amelanotic melanoma because color variation, the most eye-catching warning sign, is absent. Dermatologists suggest adding three additional red flags to your self-checks: anything that is red, raised, and recently changed. A pink or flesh-colored bump that appeared recently and keeps growing deserves the same suspicion as a dark, irregular mole.
Skin Cancer on Dark Skin
Skin cancer on darker skin tones often shows up in places people don’t think to check. Acral lentiginous melanoma, the most common type of melanoma in people of color, develops on the palms of the hands, soles of the feet, and under fingernails or toenails. It occurs at equal rates across all racial backgrounds, but because other types of melanoma are rarer in darker-skinned individuals, acral lentiginous melanoma makes up a larger share of cases.
On the palms or soles, it typically begins as a brown or black discoloration that looks like a bruise or stain. The key difference from an actual bruise is that it doesn’t fade over days or weeks. Instead, it slowly grows. Under the nails, it appears as a dark vertical line running from the base of the nail to the tip, almost as if someone drew a stripe with a brown or black marker. As it progresses, the pigment may spread beyond the nail onto the surrounding skin, a sign known as Hutchinson’s sign. The nail itself may crack or break. These changes are sometimes mistaken for a fungal infection or dried blood under the nail, which can delay diagnosis.
The Two-Week Rule
With so many possible appearances, the simplest guideline is time-based. Any new or changing spot on your skin that persists for two weeks or more is worth having a professional evaluate. This includes sores that won’t heal, bumps that keep growing, patches that feel rough and don’t resolve, and moles that shift in appearance. Skin cancer at its earliest stages is highly treatable, and the visual signs are almost always present before it becomes dangerous. The challenge is recognizing that those signs don’t always look dramatic. They look ordinary, which is exactly why paying attention to what doesn’t go away matters more than waiting for something that looks obviously wrong.