A case report on azathioprine induced anagen effluvium, plica polonica, and bicytopenia in a patient of vitiligo.

Background: Anagen effluvium is described as abrupt hair loss during the anagen phase due to reduced follicular mitotic activity. Chemotherapeutic medicines, toxic metals, and sporadically bismuth, levodopa, colchicine, and cyclosporine are often implicated in etiology. Plica polonica is a rare disorder that develops when the scalp hair mats completely and abruptly, resulting in an extended stiff mass of hair that resembles dreadlocks.