Moles - Types

What types of moles do you have?

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What types of moles are there?

There are three basic types or groups of moles: regular, irregular, and cancerous. Irregular moles are also called atypical moles. Regular moles are typically benign and friendly. Regular moles are usually symmetrical, have regular borders, uniform color, and are about the size of a pencil eraser or smaller. Regular moles may be flat or raised. The presence of hair growing from a mole is unrelated to its cancer potential.

Irregular or atypical moles are usually asymmetrical, with irregular borders, multiple colors, and tend to be bigger than the size of a pencil eraser. Irregular moles are often flat or nearly flat. Having more than 20-25 irregular moles may increase the person's overall risk of developing melanoma. The presence of a giant congenital mole greater than approximately 8-10 inches in size also may confer an increased risk of melanoma. Irregular moles signal the potential for developing melanomas over time. Irregular moles themselves rarely turn into melanoma or cancer.

Cancerous moles like melanomas are highly irregular and have already become malignant. A small number of regular moles may potentially evolve and become irregular or cancerous over time. It is important to watch all moles closely for change or atypical features. Monthly skin self-examinations and at least annual full-body moles exams by a dermatologist are important in the early detection of abnormal moles and melanoma.

  • A -- Asymmetrical
  • B -- Irregular borders
  • C -- Multiple colors
  • D -- Diameter bigger than a pencil eraser
  • E -- Evolving, changing, or new

Irregular moles can occur anywhere on the body but are most commonly located on sun-exposed skin, especially on the upper back and shoulders where people frequently get their most severe sunburns. The risk of melanoma is greater on sun-damaged skin like the shoulders, upper back, head, and neck. Ears are a particularly common site of atypical moles because of the difficulty in applying sunscreen and frequent sun exposure. Women have increased risks of atypical moles, particularly on the lower leg and calf. Any new or changing irregular mole on a woman's calf warrants immediate medical evaluation.

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