Early melanoma typically appears as a flat or slightly raised spot with uneven color, irregular edges, or an asymmetric shape that stands out from your other moles. It can be brown, black, tan, or even pink, and it often changes over weeks to months. Catching it at this stage, before it grows deeper into the skin, is critical: the five-year survival rate for localized melanoma is effectively 100%.
The ABCDE Checklist
The most widely used framework for spotting a suspicious mole breaks down into five features. You don’t need all five to be present. Even one is enough reason to get a spot checked.
- Asymmetry. If you drew a line down the middle of the mole, the two halves wouldn’t match. Benign moles are usually round or oval and roughly symmetrical.
- Border irregularity. The edges look uneven, scalloped, or blurred rather than smooth and well-defined.
- Color variation. Instead of one uniform shade of brown, the spot contains multiple colors or shades: tan, dark brown, black, red, white, or blue mixed together.
- Diameter. The spot is larger than about 6 millimeters, roughly the size of a pencil eraser. Melanomas can be smaller than this, but size matters when combined with other warning signs.
- Evolving. Any change in size, shape, color, or height. New symptoms like itching, bleeding, or scabbing also count.
Of these five, “evolving” may be the most important single sign. A mole that looked the same for years and suddenly starts changing deserves attention regardless of how it scores on the other criteria.
The “Ugly Duckling” Sign
The ABCDE criteria work well for evaluating a single spot, but they have a blind spot: some early melanomas don’t look obviously irregular on their own. That’s where the ugly duckling approach helps. Most people’s moles share a family resemblance. They tend to be similar in size, shape, and color. A spot that looks nothing like the others, the outlier on your skin, is the one most likely to be suspicious. If you have dozens of small, light-brown moles and one dark, slightly larger spot that just looks “off,” that mismatch is worth flagging even if it doesn’t tick every ABCDE box.
Where Melanoma Tends to Appear
Melanoma can develop anywhere on the body, including areas that rarely see the sun, but it follows patterns. In men, the most common site is the trunk, particularly the back and chest, with a higher incidence on the head and neck compared to women. In women, the legs are the most frequent location. These patterns hold across different latitudes and populations.
Because the back is hard to see yourself, melanomas in men are often caught later. Checking your own skin regularly matters, but so does having someone else look at hard-to-see areas.
Pink and Skin-Colored Melanomas
Not all melanomas are dark. Amelanotic or hypomelanotic melanomas contain little to no pigment, so they can appear pink, red, or close to your normal skin tone. These are significantly harder to identify because they break the rules: they may look symmetric and lack the dark color most people associate with skin cancer. They’re frequently mistaken for other conditions.
The most reliable visual clue for these lighter melanomas is the presence of more than one shade of pink within the same lesion. A study in The Journal of Dermatology found that having multiple pink tones in a single spot increased the odds of it being melanoma by roughly 37 times compared to benign pink lesions. In melanomas, the pink color tends to appear throughout the spot or at its edges, while benign pink lesions more often have pink concentrated in the center. Irregular dots or tiny structures within the spot and an asymmetric pattern of any faint pigment are additional red flags.
If you notice a persistent pink bump or patch that doesn’t heal, doesn’t look like your other spots, or slowly grows, treat it with the same concern you would a dark mole.
Melanoma on Palms, Soles, and Nails
Acral lentiginous melanoma develops on the palms of the hands, soles of the feet, or under the nails. It’s the most common type of melanoma in people with darker skin tones, though it can occur in anyone. Early on, it looks like a brown or black discoloration that might resemble a bruise or stain, but unlike a bruise, it doesn’t fade. Over time, it grows in size and becomes more irregular.
Under a fingernail or toenail, melanoma usually appears as a dark vertical streak running the length of the nail. It can be mistaken for a fungal infection or dried blood under the nail. One important warning sign is when the dark pigment extends beyond the nail itself onto the surrounding skin of the cuticle or fingertip. This spillover of pigment is a well-known clinical indicator that the streak may be melanoma rather than a harmless nail mark. As it progresses, the nail may crack, break, or lift away from the nail bed.
What “Early” Means in Terms of Depth
When doctors describe melanoma as “early,” they’re talking about how deep it has grown into the skin. The earliest possible stage, called melanoma in situ (stage 0), means the abnormal cells are confined entirely to the outermost layer of skin, the epidermis. They haven’t broken through the basement membrane, the thin barrier separating the surface layer from the deeper tissue below.
Stage IA melanoma has pushed slightly deeper but is still 1 millimeter thick or less, with no ulceration (no broken skin surface over the tumor). At these depths, the melanoma is still localized and highly treatable. The thinner the melanoma at the time of removal, the better the outcome. That’s why the visual changes described above matter so much: they’re the surface signals of a process that, caught early, carries a near-perfect prognosis.
How to Check Your Own Skin
A thorough self-exam takes about 10 minutes and should cover every surface of your body. Use a full-length mirror and a hand mirror for your back, the backs of your legs, and your scalp. Check between your toes, the soles of your feet, your palms, and your nail beds. These are easy to overlook and exactly where certain melanomas hide.
The goal isn’t to diagnose yourself. It’s to notice change. Taking photos of moles you want to track gives you a reliable comparison over time. A spot that looks slightly different from last month is easier to catch when you have a reference image on your phone. If anything is new, changing, or fits the patterns described above, a dermatologist can evaluate it quickly with a dermatoscope, a magnifying tool that reveals structures invisible to the naked eye, and biopsy anything that looks concerning.