Naevus. This is a term applied to a pigmented patch of skin, or to an overgrowth of capillaries bound together by connective tissue (the ordinary capillary naevus), or, again, to the tumours containing inter-communicating spaces more allied to veins than to capillaries, the venous or cavernous naevus. Naevi usually exist from birth; they often remain practically stationary; they may undergo gradual enlargement or may waste away and disappear. Capillary naevi usually affect the skin of the head and face. Save for the disfigurement they cause, they are of little importance.