Trichostasis Spinulosa: A Case Report of an Unusual Presentation in the Groin of a Pediatric Patient on Clonidine.

Trichostasis spinulosa (TS) is a follicular disorder involving the retention of numerous hairs in a dilated follicle, primarily reported in adults. Drug-induced TS and pediatric TS are rarely described in the literature. We report a four-year-old female with an unusual presentation of TS localized in the groin and vulva. Interestingly, the patient's TS seemed to worsen with the introduction of clonidine for her autism spectrum disorder (ASD). The rash improved significantly once clonidine was held, and recurred when clonidine was re-started. This case highlights that TS should be considered in pediatric patients, even in atypical locations, and clonidine may exacerbate TS.