Moles are collections of pigmented cells that are generally harmless as long as they are stable and symmetrical. However, if a mole changes shape, color, or size—or worse, it itches, bleeds, or crusts over—this could indicate melanoma or another type of skin cancer. Early detection is essential for successful treatment.

The ABCDE rule for identifying suspicious moles:

To distinguish harmless moles from those that require examination, dermatologists recommend the ABCDE rule:

– Asymmetry:     One half of the mole doesn’t match the other.
– Border:     The edges are irregular, blurred, or uneven.
– Color:     The color tones within the mole vary (brown, black, red, white, or blue).
– Diameter:     More than 6 millimeters (about the size of an eraser).
– Evolution:     The appearance changes over time.

If a mole meets these criteria, see a doctor immediately.

Other types of skin growths to look out for:

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