A mole is a collection of skin cells containing an unusually high level of the skin pigment known as melanin. Most moles are acquired traits, appearing during the first two decades of a person's life. In the image below, a doctor is examining a mole on a male patient's back.

Most moles are the result of an error in

the way skin cells grow and divide. While moles are generally harmless, some may develop into skin cancer, particularly if they change in size, shape, or color. It's important to regularly check moles for any changes and to see a doctor if you notice any concerning signs. Regular skin checks and visits to a dermatologist can help monitor moles and reduce the risk of skin cancer.