Alopecia (Hair Loss; Baldness) By Wendy S Levinbook, MD, Hartford Dermatology Associates Reviewed / Revised Jun 2022 | Modified Sep 2022 View Patient Education Pathophysiology Etiology Evaluation Treatment Key Points Topic Resources Androgenetic Alopecia Male - and female-pattern... Chemotherapy-Induced Anagen... Acne Keloidalis Nuchae Trichotillomania Some Causes of Alopecia Interpreting Physical Findings... Alopecia is defined as loss of hair from the body.