Alopecia areata: evidence-based treatments.

Alopecia areata is a common condition causing nonscarring hair loss. It may be patchy, involve the entire scalp (alopecia totalis) or whole body (alopecia universalis). Patients may recover spontaneously but the disorder can follow a course of recurrent relapses or result in persistent hair loss. Alopecia areata can cause great psychological distress, and the most important aspect of management is counseling the patient about the unpredictable nature and course of the condition as well as the available effective treatments, with details of their side effects. Although many treatments have been shown to stimulate hair growth in alopecia areata, there are limited data on their long-term efficacy and impact on quality of life. We review the evidence for the following commonly used treatments: corticosteroids (topical, intralesional, and systemic), topical sensitizers (diphenylcyclopropenone), psoralen and ultraviolet A phototherapy (PUVA), minoxidil and dithranol.