Ulcers are a break in the continuity of the skin that may fail to heal. Usually appears as a crater, which can be shallow, affecting the skin surface only or deeper affecting the bones, tendons or other structures. The main cause of ulcers is poor blood circulation and can even lead to gangrene and amputation especially in diabetics if left untreated. Other causes include trauma, infections, tumours, vascular diseases and some skin conditions. Arterial and venous ulcers are quite common, venous ulcers have a higher incidence.