Hirsutism and Hypertrichosis 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 Hirsutism Some Causes of Hirsutism Causes of Hypertrichosis Interpreting Findings in... Hirsutism is the excessive growth of thick or dark hair in women in locations that are more typical of male hair growth patterns (eg, mustache, beard, central chest, shoulders, lower abdomen, back, inner thigh).