These changes occur slowly during a lifetime. Over many years, moles slowly change and become more raised. At first, moles are flat, pink, brown, or black in color. They may also get darker and larger during the teen years, during pregnancy, and while taking birth control pills. The brown color may vary in shade, but it is usually uniform within individual mole. They vary in size from a pinhead to a pencil eraser. The dome-shaped mole or compound nevus.There are three types of acquired moles: Figure 02 Figure 03 Figure 04 Moles that appear after birth are called common acquired melanocytic nevi (moles). Large congenital nevi, several inches across in an adult, have a higher tendency to develop into malignant melanoma. Most of these moles are small, the size of a pencil eraser, dome-shaped, and may have some hair within. Figure 01Ī congenital nevus is a mole present at birth. Factors that determine the number of moles include familial or genetic predisposition and sun and ultraviolet light exposure. The number of moles peak in individuals during their 30s and have a tendency to decrease in number thereafter. Most moles appear in individuals during their 20s, though some may appear later in life and some may be present at birth. Moles are benign (noncancerous) growths of the skin caused by the proliferation of melanocytes, which produce the dark protective pigment in the skin called melanin.
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