A mole, medically known as a nevus, is a common skin growth that can appear anywhere on the body. Moles are typically brown or black and can be flat or raised. They are formed when clusters of cells grow together. Most moles are harmless and appear during childhood or adolescence, though some can develop later in life. Most moles are benign, however it is important to note changes in moles or new moles because they can sometimes be a sign of melanoma. If you have suspicious looking moles it is important to get it looked at by a healthcare professional.