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Avulsion. When pieces of skin and subcutaneous tissue are avulsed the ensuing defect either should be closed by primary suture or should be covered with a skin graft. A split- skin graft will grow on periosteum, tendon sheath, fat, or fascia and should be applied even if the blood supply to the base of the wound is not very promising. Skin is nourished by the lymph and will survive surprisingly well provided that too much contamination is not present.