Melanoma can appear in a wide range of colors, not just the dark brown or black most people expect. Shades of black, brown, and tan are the most common, but melanoma can also contain areas of white, gray, red, pink, or blue. Some melanomas have no dark pigment at all and look pink or skin-colored. The key warning sign isn’t any single color; it’s uneven color within a single spot, especially three or more distinct shades.
The Colors Most Melanomas Share
The majority of melanomas retain at least some melanin, the pigment that gives skin its color. That means most appear in some combination of brown, dark brown, tan, and black. What sets melanoma apart from an ordinary mole is how those colors are distributed. A normal mole is typically one uniform shade of brown. A melanoma tends to have patches of different shades mixed together in an irregular pattern, sometimes described as looking like a “splatter” of color rather than an even fill.
This uneven coloring is what dermatologists call variegation. Benign moles usually contain one or two colors, while melanomas frequently show three or more. That color variety happens because the cancerous cells are producing pigment at different rates in different parts of the lesion. As some melanoma cells divide rapidly, they may produce heavy amounts of dark pigment while others lose the ability to make pigment almost entirely. The result is a patchwork of light and dark areas within a single spot.
What Each Color Means
Different colors within a melanoma reflect what’s happening beneath the skin’s surface at different depths and stages.
- Brown and tan: Melanin produced by cancer cells near the skin’s surface. The most common starting colors.
- Black: Dense concentrations of melanin, often in thicker or more advanced areas of the lesion.
- Blue or blue-gray: Pigment located deeper in the skin. A blue-whitish veil over part of a mole is one of the strongest clues that a spot may be melanoma rather than a harmless growth.
- White: Areas whiter than the surrounding skin indicate scarring or fibrosis, a sign the immune system has attacked part of the tumor and the tissue has regressed. This doesn’t mean the cancer is gone.
- Red or pink: Increased blood vessel activity. As melanoma grows thicker, it develops new, irregular blood vessels that give areas a reddish or milky-red appearance.
The blue-black combination is particularly important. Research published in JAMA Dermatology found that the “blue-black sign” was the single most helpful visual clue for correctly identifying melanomas that otherwise looked like harmless age spots or seborrheic keratoses. If you see blue or blue-black coloring in a mole, that warrants a professional evaluation even if the spot looks unremarkable otherwise.
When Melanoma Has No Dark Color at All
About 2 to 8 percent of melanomas produce little to no melanin. These are called amelanotic melanomas, and they’re easy to miss because they don’t match the mental image most people have of skin cancer. Instead of brown or black, they appear as pink, red, or skin-colored bumps or flat patches. Some look like a pimple that won’t heal, an irritated patch of skin, or a small red nodule.
Under magnification, these lesions often show abnormal blood vessel patterns and milky-red areas rather than the pigment networks seen in typical melanoma. Some partially pigmented melanomas fall in between: they have faint wisps of light brown, light blue, or light gray covering less than a quarter of the spot, with the rest appearing pink or red. Because these melanomas lack the obvious dark coloring people are trained to watch for, they’re more likely to be diagnosed at a later stage.
Melanoma Under the Nails
Melanoma can develop beneath a fingernail or toenail, where it looks completely different from a skin mole. In roughly 65% of cases, it first appears as a dark vertical streak running the length of the nail. These bands are typically brown to black, wider than 3 millimeters, and may widen toward the base of the nail or have irregular, blurry borders.
The thumbs, big toes, and index fingers are the most commonly affected digits. One important warning sign is the Hutchinson sign, where dark pigment spills from beneath the nail onto the surrounding skin of the cuticle or nail fold. This spread of color beyond the nail itself is strongly associated with subungual melanoma. A bruise under the nail, by contrast, is usually painful, tied to a specific injury, and gradually moves toward the tip of the nail as it grows out.
How Melanoma Looks on Darker Skin Tones
Melanoma on darker skin (Fitzpatrick types IV through VI) disproportionately appears on the palms, soles, and nail beds rather than on sun-exposed areas. This subtype, called acral lentiginous melanoma, accounts for a small percentage of all melanoma cases but is the most common form in people of African, Asian, and Native American descent.
On the palms and soles, it presents as irregularly pigmented patches, often with a mix of brown, dark brown, and black tones against skin that doesn’t typically have moles. On nail beds, it appears as the dark streaks described above. One of the challenges is that melanoma on darker skin is often diagnosed later, when tumors are thicker and more likely to be ulcerated. Paying attention to new or changing dark patches on the hands and feet is especially important for people with deeper skin tones, since standard skin cancer screening advice tends to emphasize moles on sun-exposed areas.
Melanoma in the Eye
Melanoma can also develop inside the eye, most commonly in the layer beneath the retina. Uveal melanoma may not be visible to you at all, but iris melanoma (on the colored part of the eye) can cause a noticeable change in iris color or a dark spot on the iris. These tumors range from completely unpigmented to heavily pigmented, and a single tumor can contain areas of different pigmentation levels. Some patients first notice that one eye seems to be changing color or that their pupil looks distorted.
Using Color in the ABCDE Check
Color is the “C” in the ABCDE framework used to evaluate suspicious spots. The full checklist: Asymmetry (one half doesn’t match the other), Border irregularity (edges are ragged or blurred), Color variation (multiple shades or unusual colors), Diameter (larger than 6 millimeters, roughly the size of a pencil eraser), and Evolving (any change in size, shape, or color over time).
No single feature confirms melanoma on its own. But color variegation is one of the most reliable visual signals, particularly when a spot contains three or more colors or includes blue, black, or white alongside the more expected brown shades. The “E” for evolving may be the most practical criterion for everyday self-checks: any mole that is gaining new colors, losing color in patches, or looking different than it did a few months ago deserves a closer look from a dermatologist.