What are Moles?

There are several skin lesions that are very common and benign (non-cancerous). These conditions include moles, freckles, skin tags, benign lentigines, and seborrheic keratoses.

Moles and Your Skin

Moles are growths on the skin that are usually brown or black. Moles can appear anywhere on the skin, alone or in groups.

Most moles appear in early childhood and during the first 25 years of a person's life. It is normal to have between 10-40 moles by adulthood.

As the years pass, moles usually change slowly, becoming raised and/or changing color. Sometimes, hairs develop in the mole. Some moles may not change at all, while others may slowly disappear over time.

What Causes a Mole?

Moles occur when cells in the skin grow in a cluster instead of being spread throughout the skin. These cells are called melanocytes, and they make the pigment that gives skin its natural color. Moles may darken after exposure to the sun, during the teen years, and during pregnancy.

Types of Moles

Congenital nevi occur in about one in 100 people. These moles are slightly more likely to develop into melanoma (cancer) than are moles that appear after birth. A mole or freckle should be checked if it has a diameter of more than a pencil eraser or any characteristics of the ABCDEs of melanoma.

Dysplastic Nevi Close-Up Dysplastic nevi are moles that are generally larger than average (larger than a pencil eraser) and irregular in shape. They tend to have uneven color with dark brown centers and lighter, uneven edges. These nevi are somewhat more likely to become melanoma. In fact, people who have 10 or more dysplastic nevi have a 12 times higher chance of developing melanoma, a serious form of skin cancer. Any changes in a mole should be checked by a dermatologist to evaluate for skin cancer.

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