Circle Hairs Involving the Extremities in a Young Girl

This document described a case of circle hairs (CHs) in a 20-year-old female, which was unusual as CHs were typically observed in elderly, hairy, and obese males. CHs were characterized by asymptomatic, circular or spiral hair growth beneath the stratum corneum, without follicular or inflammatory abnormalities. The exact cause of CHs was unknown, but they were considered a benign, genetically predetermined disorder possibly linked to vestigial mammal undercoats. The case highlighted the use of trichoscopy for diagnosis and noted that CHs needed differentiation from rolled hairs, which were associated with follicular hyperkeratosis and inflammation. Treatment options included plucking or laser ablation, although regrowth was possible.