The chronic effects of repeated mechanical trauma to the skin.
D000367:Age Factors; D006801:Humans; D009784:Occupational Diseases / Q000209:etiology*; D012008:Recurrence; D012621:Seasons; D012737:Sex Factors; D012867:Skin / Q000293:injuries*; D012871:Skin Diseases / Q000453:epidemiology / Q000209:etiology*