Chronic Sores could be danger signal of Cancer. Any sores that does  not heal whithin two or three weeks could be due to cancer of skin.

Such sores may be found on the face, hands, arms, legs, and other parts of the body. There is no use putting ointment on the sores and hoping it will go away. If it is a cancer, it must be treated properly. Surgery is the best means at present available.

image courtesy: [adventuredoc.net]