Terra firma-forme dermatosis: A case report

        Terra firma-forme dermatosis (dermatosis neglecta) is a cutaneous discoloration, which is characterized by idiopathic retention hyperkeratosis, resulting in dirty-or “solid earth”–like brown, asymptomatic plaques that can easily be removed with gentle alcohol swabbing. The pathogenesis has been attritubed to abnormal and delayed keratinization. Terra firma-forme dermatosis is an idiopathic condition first described 20 years ago, also called Duncan’s dirty dermatosis. The 8-year-old female patient had been admitted to the outpatient clinic with complaints of asymptomatic brown lesions on her legs for 5 years, and the family reported that the lesions had spread among to the trunk and arms for 2 weeks. Dermatologic examination revelaed hyperpigmented plaques involving front face of trunk, arms, and legs. The lesions disappeared after firm rubbing with 70% of alcohol. Terra firma-forme dermatosis should not be confused with hyperpigmented lesions. Recognizing this condition avoids unnecessary aggressive diagnostic and therapeutic procedures because it is more easy to diagnose and treat.
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