Early melanoma typically looks like a new or changing spot on the skin with uneven color, irregular edges, or an asymmetric shape. It can appear as a flat, dark patch no bigger than a pencil eraser, though some start even smaller. The tricky part is that melanoma doesn’t always follow one pattern. It can be brown, black, pink, or even skin-colored, and it can show up anywhere on the body, including places that rarely see the sun.
The ABCDE Rule for Spotting Early Melanoma
The most widely used framework for identifying a suspicious spot is the ABCDE rule, developed by dermatologists to help people evaluate moles and new growths at home.
- Asymmetry. If you drew a line through the middle, the two halves wouldn’t match. Normal moles are usually round and symmetric.
- Border irregularity. The edges look ragged, notched, or blurred rather than smooth. The pigment may seem to bleed into the surrounding skin.
- Color that is uneven. Instead of one uniform shade, you see a mix of brown, tan, and black. Some spots also contain patches of white, gray, red, pink, or blue.
- Diameter. Most melanomas are larger than about 6 millimeters (roughly the size of a pencil eraser) by the time they’re diagnosed. But this is not a safe cutoff. In one study of 292 melanoma patients, 28% had tumors smaller than 6 millimeters, and more than a third of those were invasive. A small spot with other warning signs still deserves attention.
- Evolving. The spot has changed in size, shape, or color over the past few weeks or months. This is often the single most important clue. Any mole that looks different than it did recently is worth having checked.
The “Ugly Duckling” Sign
The ABCDE criteria work well for evaluating a single spot, but they can miss melanomas that don’t fit the textbook description. That’s where the “ugly duckling” approach helps: the mole that looks nothing like your other moles is the most suspicious one. Most people’s moles share a general family resemblance in color, size, and shape. If one spot stands out as clearly different from the rest, that contrast itself is a warning sign, even if the spot doesn’t check every ABCDE box.
How Different Types of Melanoma First Appear
Superficial Spreading Melanoma
This is the most common form, and it’s the one the ABCDE rule was designed to catch. It starts as a flat or slightly raised patch that grows outward across the skin’s surface before growing deeper. Early on, patients often describe noticing the spot hardening or becoming more solid to the touch. The color tends to be mixed, with shades of brown, tan, and black that shift over time. These spots can appear anywhere on the body, though they’re common on the trunk in men and the legs in women.
Nodular Melanoma
Nodular melanoma behaves differently and can be harder to catch early because it grows vertically into the skin rather than spreading outward. It often starts as a small, dome-shaped bump that is elevated, firm, and growing, sometimes called the EFG criteria. Patients who caught theirs early have described it as a “tiny, tiny little spot” or even a “little white dot” that changed quickly. Some reported the color shifting from brownish to darker with brown tinges, or from brown to black “in a dripping pattern,” all within about two weeks.
Over months, early nodular melanomas can develop a puffy texture or feel different to the touch in ways that are hard to pin down. Patients frequently describe a tactile sense that something “did not feel right” before the spot looked obviously alarming. Blood spots appearing under or around the mole are another early signal specific to this type.
Lentigo Maligna
This type develops on chronically sun-damaged skin, most often the face, ears, or scalp of older adults. It starts as a slowly growing, flat, irregularly shaped patch of dark pigment that can look similar to an age spot or sun spot. The borders are often ill-defined and hard to see clearly, and the lesion frequently extends beyond what’s visible to the naked eye. In fair-skinned people, it can appear as a light or barely pigmented patch rather than a dark one. One unusual early clue: previously white or gray hair in the area may start growing back in with color again, a sign that pigment-producing cells beneath the surface are becoming active.
Acral Lentiginous Melanoma
This form appears on the palms, soles of the feet, or under the nails, areas most people don’t think to check. On the palm or sole, it starts as a brown or black discoloration that can look like a bruise or stain. Unlike a bruise, it doesn’t fade. It grows slowly in size over time.
Under a fingernail or toenail, it usually appears as a dark vertical streak running the length of the nail bed. It’s often mistaken for a fungal infection or dried blood beneath the nail. As it progresses, the nail may crack or break. This type is the most common form of melanoma in people with darker skin tones, so it’s especially important to check these areas regularly.
Amelanotic Melanoma
About 2% of melanomas produce little or no pigment, making them particularly easy to miss. Instead of a dark spot, amelanotic melanoma often shows up as a pink to red flat mark, small bump, or firm nodule that looks nothing like a typical mole. It can resemble a pimple, a scar, or an insect bite that simply won’t heal. Because it lacks the dark coloring people associate with melanoma, it’s frequently diagnosed later. If you have a pink or reddish bump that persists for several weeks without an obvious cause, it’s worth having a professional look at it.
What People Actually Notice First
Research on how patients themselves first detect their melanomas reveals patterns that go beyond textbook descriptions. Many people don’t start with a visual clue at all. They notice a spot that feels different: slightly raised when it was once flat, firmer than the skin around it, or just somehow “off” to the touch. Others notice rapid color change as the first sign, watching a brownish mole turn darker or develop new shades within weeks.
Bleeding is another common early signal, though it varies by type. With nodular melanoma, people report finding small blood spots under or around the mole. With thicker, more advanced lesions, bleeding tends to happen after shaving over the spot or picking at it. In superficial spreading melanoma, bleeding is less typical in the early stages.
Speed of change matters too. The flat, spreading types tend to evolve over months. Nodular melanoma can change visibly in as little as two weeks, shifting shape from round to oblong or darkening noticeably in that short window. If a spot on your skin is changing that fast, treat it as urgent.
Where to Look
Melanoma can develop anywhere you have skin, including areas that get little sun exposure. The most commonly missed locations are the scalp (hidden by hair), between the toes, on the soles of the feet, under the nails, and on the back where you can’t easily see. A monthly self-check should include these spots. Use a hand mirror or ask someone to look at hard-to-see areas like your back and the back of your neck. Familiarity with your own skin is the best early detection tool you have, because the most reliable warning sign is change.