However in certain cases the melanocye cells may start to grow in an abnormal way, which may result in melanoma, a cancer of the skin. Usually melanocyte cells grow normally and so the growth is usually benign. - Heredity - Exposure to sunlight - Hormonal changes - Age The principle reason for this is too much exposure to sunlight. A skin mole is caused by the melanocyte cells in the skin. Heavy exposure to sunlight during childhood and the teenage.

It is formed when melanocyte cells do not spread thought the skin but grow in clusters. Most of them are present at birth while others appear as the person grows older.

These cells produce melanin and are responsible for the color of the skin, eyes and hair. Their main causes depend mainly on. Some may also disappear with age. Skin moles are growths on the skin, often round or oval-shaped with a dark color. Some skin moles are flat while others are a bit raised from the skin.

The color may however vary to different shades.