Trauma, sports, and the skin.

Dermatological disorders in athletes may occur as a result of repeated mechanical trauma, physical and chemical agents, climatic conditions, infections, infestations, and exacerbations of pre-existing skin disorders. These include black heel, tennis toe and other causes of subungual hemorrhage, friction blisters, abrasions, jogger's nipples, alopecia, calluses, and subcutaneous nodules. Contact dermatitis may occur from sports equipment, medications used to treat abrasions, and plants such as poison ivy and weeds. Herpes simplex and bacterial pyoderma may occur in wrestlers and rugby players, especially at sites of abrasion.