Moles are extremely common and most adults have multiple such growths. Moles form when melanin producing cells, called melanocytes, grow into clusters. While many moles are brown, they can appear in other colors including pink, tan, flesh-tone and dark brown. Some skin cancers may develop in or near moles, so it is important know what your existing moles look like and examine them for changes periodically. Your doctor can help you to identify potentially suspicious moles. It is normal for children and young adults to develop new moles, as well as for existing moles to lighten, darken or grow as a child does, but if you have concerns about the appearance of a mole on yourself or your child, please contact your doctor.