Most moles are small, round, evenly colored spots that range from flesh-toned to dark brown or black. A typical mole measures 1 to 6 millimeters across (smaller than a pencil eraser), has a symmetric shape, and smooth, regular borders. But moles come in several varieties, and knowing what’s normal helps you spot what isn’t.
What a Common Mole Looks Like
A common mole, sometimes called a nevus, is a uniform spot of color on the skin. It can be flat or slightly raised, and its color stays consistent throughout, whether that’s flesh-colored, yellow-brown, tan, or dark brown to black. The defining features are its symmetry and neat edges. If you drew a line down the middle, both halves would roughly match. Most people have between 10 and 40 common moles by adulthood, and they tend to appear on sun-exposed areas like the face, arms, and torso.
Common moles can change slowly over time. Some darken slightly, others fade, and a flat mole may become slightly raised with age. These gradual shifts over years are normal. What matters is how a mole compares to its usual state and to other moles on your body.
Moles Present at Birth
Some babies are born with moles, called congenital moles. These present as round or oval pigmented patches that may have one shade or multiple shades of brown. Their surface is often slightly rough or bumpy compared to common moles, and they may grow dark hairs. Around puberty, congenital moles often become darker, bumpier, and hairier.
These moles are categorized by size. Small ones are under 1.5 centimeters. Medium ones range from 1.5 to about 20 centimeters. Large or giant congenital moles measure 20 centimeters or more and can cover significant areas of the body. Larger congenital moles carry a higher risk of complications and are typically monitored more closely.
Atypical Moles
Atypical moles (also called dysplastic nevi) look noticeably different from common moles. They’re usually wider than 5 millimeters, have irregular or fading edges, and contain a mixture of colors ranging from pink to dark brown within a single spot. The surface is typically flat with a slightly scaly or pebbly texture. Some have a raised center surrounded by a flatter ring of color, sometimes described as a “fried egg” appearance.
Having atypical moles doesn’t mean you have skin cancer, but it does signal a higher risk. People with many atypical moles benefit from regular skin checks so any changes can be caught early.
Spitz Nevi in Children
Spitz nevi are a distinct type of mole that usually appears during childhood. They look quite different from typical moles: a round, dome-shaped, pink or red bump. Because of their unusual color and shape, they can be alarming to parents, but Spitz nevi are benign. A dermatologist can confirm the diagnosis, sometimes with a biopsy, since their appearance can overlap with more serious skin lesions.
How Moles Look on Darker Skin
Moles on darker skin tones follow the same general rules: symmetry, even color, and smooth borders are reassuring signs. However, the type of skin cancer most common in Black, Hispanic, and Asian populations tends to appear in places people don’t always think to check. It shows up on the palms, soles of the feet, and under the nails as a slow-growing, tan-to-black patch with irregular, asymmetric borders.
Under a nail, the warning sign is a dark streak running lengthwise along the nail, sometimes with pigment spreading onto the surrounding skin. These early lesions can look like a bruise or a benign nail condition, which contributes to delayed diagnosis. Five-year survival rates for this type of melanoma are significantly lower in Black and Hispanic populations, partly because it’s caught at later stages. Checking your palms, soles, and nails during self-exams is especially important if you have darker skin.
The ABCDE Warning Signs
The ABCDE rule is a practical framework for evaluating any mole on your body:
- Asymmetry: One half of the mole doesn’t match the other half in shape.
- Border: The edges are ragged, notched, or blurred rather than smooth. Pigment may spread into the surrounding skin.
- Color: Multiple colors appear within the same mole, including shades of brown, black, tan, white, gray, red, pink, or blue.
- Diameter: The mole is larger than 6 millimeters (about the size of a pencil eraser), though melanomas can sometimes be smaller.
- Evolving: The mole has changed in size, shape, color, or texture over the past few weeks or months.
No single feature on its own confirms melanoma. But if a mole checks more than one of these boxes, it warrants a closer look from a dermatologist.
The “Ugly Duckling” Approach
Beyond the ABCDE criteria, there’s a simpler screening concept that works well for self-checks. Your moles tend to resemble one another. They share a general color palette, size range, and shape. A mole that stands out as the obvious outlier, the one that doesn’t look like any of the others, deserves attention. This “ugly duckling” method works because melanoma often deviates from your personal pattern of normal moles, making it visually distinct even before it meets all five ABCDE criteria.
Growths That Look Like Moles but Aren’t
Not every dark spot on your skin is a mole. Seborrheic keratoses are extremely common growths that appear as slightly raised, discolored patches. They range from white to black, often look waxy or scab-like, and have a “stuck on” quality, as if they’ve been pasted onto the skin’s surface. Unlike moles, they tend to appear in clusters and become more frequent with age. They’re painless and harmless, though their dark, rough texture can make them easy to confuse with something more serious.
Skin tags are another benign growth people sometimes mistake for moles. They’re small, soft, flesh-colored flaps that hang from the skin by a thin stalk, typically in areas where skin folds, like the neck, armpits, and groin. Their hanging, floppy shape distinguishes them easily from flat or dome-shaped moles.