D10-D36: Benign neoplasms

D22: Melanocytic naevi

Melanocytic naevi, usually referred to as moles, are dark, small, and often round growths on the skin caused by clusters of pigmented cells known as melanocytes. They often appear in early childhood but can form at any age. Most moles are benign and stay that way throughout a person's life, though occasionally some may become cancerous. These skin growths vary in color from pink to dark brown or black, and they can occur anywhere on the body. However, moles are not typically painful unless they become irritated or inflamed from friction, such as rubbing against clothing. Melanocytic naevi, in general, do not affect any other body systems beyond the skin and are not typically caused by any other health issues. The primary cause of these growths is genetic, though exposure to the sun can also influence mole development.