Alopecia areata with white hair regrowth: case report and review of poliosis

Alopecia areata, an autoimmune disease causing non-scarring hair loss, was observed in a 57-year-old man who experienced white hair regrowth in previously affected areas. This phenomenon, known as poliosis, involves localized hair depigmentation due to melanin deficiency. A literature review indicated that poliosis can be linked to autoimmune diseases like alopecia areata, as well as other conditions such as cutaneous lesions, genetic syndromes, infections, medication use, and trauma. The study suggested that the occurrence of poliosis in areas of prior alopecia areata-related hair loss might be more common than currently documented.