Psoriasis. Split nails of a 61-year-old woman. Psoriasis is a common skin disease involving a large increase in the speed of epidermal (outer skin layer) cell production, which causes scaly pink patches to form. In this case they have caused the nails to ride longitudinally and split. Psoriasis may be caused by certain infections, stress, or be drug-induced. Treatment, depending upon the cause, may involve ointments, phototherapy and drugs.
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