Beau's Lines

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Abstract
Beau's lines are transverse grooves on the nail surface that are the result of the temporary arrest of nail matrix formation. The transitory interference with nail growth rates is usually induced by severe systemic disability or disease. Measles, mumps, pneumonia, excessive exposure to cold, the carpal tunnel syndrome, and acrodermatitis enteropathica1 have all been reported as causes of Beau's lines. The nail dystrophy often involves all of the nails and becomes clinically apparent weeks after the inciting event. A case of Beau's lines occurring in a patient with pustular psoriasis, and occurring simultaneously with telogen effluvium, is presented. Report of a Case A 75-year-old woman with a four-year history of psoriasis was admitted to the Medical College of Ohio Hospital, Toledo, for treatment of extensive pustular psoriasis. The patient had had two prior episodes of pustular psoriasis that had been treated with methotrexate and 0.1% triamcinolone acetonide. For the

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