Terra firma-forme dermatosis.

Terra firma-forme dermatosis (TFFD) belongs to the group of "dirty dermatoses" and represents a not well-known and surely underestimated vexing skin condition. Firstly described by Duncan, Tschen and Knox in 1987, it accounts for a few case series in the literature and has a still undefined aetiology. The authors present an additional report of TFFD, occurring in a young Caucasian girl, and briefly review the current medical literature on the topic.