Ipsilateral Post-Cast Hypertrichosis and Dyshidrotic Dermatitis

The document reported a rare case of a patient who developed both localized hypertrichosis and ipsilateral dyshidrotic dermatitis following multiple fractures and cast application. The clinical presentation, management, and resolution of these conditions were similar to when they occur independently. The diagnosis of post-cast hypertrichosis was based on the distribution and timing relative to the cast placement, and other causes were excluded. It was suggested that the trauma or the cast, or both, might have contributed to the development of dyshidrotic dermatitis. The paper also reviewed the mechanisms of pathogenesis for dyshidrotic dermatitis and summarized conditions associated with localized hypertrichosis.