Moles can be brown, tan, black, blue, red or pink. They're often less than 1/4 inch (about 6 mm) in diameter — the size of a pencil eraser.
Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission.
Check out these best-sellers and special offers on books and newsletters from Mayo Clinic Press.
Benefactor support fuels Mayo Clinic’s groundbreaking research. Make a gift today to help us save lives.