Clinical and Trichoscopic Findings in Pressure-induced Alopecia: Case Reports.

Pressure-induced alopecia is an unusual cause of nonscarring alopecia that can become permanent scarring alopecia. It occurs due to ischemia resulting from prolonged head immobilization after surgery or hospitalization, especially in intensive care units. Trichoscopy as noninvasive technique may provide relevant clues for an accurate diagnosis. "Comedone-like black dots" is a unique trichoscopic feature which can help in rapid identification of the condition and especially in the differentiation from alopecia areata. This article describes the clinical and trichoscopic features of three cases of postoperative alopecia.