Why do some people have so many moles?

Why do some people have so many moles?

Medically reviewed by Casey Gallagher, MDPARNTAWAN / Getty Images People with lighter skin tend to have more moles, often due to how the skin reacts to sun exposure.Moles, which occur when pigment cells called melanocytes cluster together, are very common. Most people have 10-40 moles on their skin, especially on sun-exposed areas. How many moles you have may depend on factors such as your genetics, sun exposure, or hormonal changes.If you have …