Age warts are the most common benign skin tumors in humans. They usually occur more frequently after the age of fifty with increasing age. Age warts are caused by a proliferation of horn-forming skin cells (keratinocytes). The changes should be differentiated from a black skin cancer by a dermatological examination. Rapid growth or bleeding tendency of the skin lesion may be signs of black skin cancer. Age warts can be removed with a laser or surgically.