KZN P Terra Firma-Forme Dermatosis

Terra Firma-Forme Dermatosis

Terra firma-forme dermatosis (TFFD) is an acquired, idiopathic, benign dermatosis characterized by an asymptomatic brownish gray or black dirtlike patch that cannot be removed with ordinary cleansing but can be removed by wiping with isopropyl alcohol or ethyl alcohol.1,2 The term is derived from the Latin phrase terra firma, meaning “dry land,” thus implying dirtlike dermatosis or dirty skin.2,3 The condition was first described by Christopher Duncan and colleagues in 1987,4 hence it also has been called “Duncan’s dirty dermatosis.” Recognition of this benign and easily treated condition is important so that unnecessary investigations and treatments can be avoided.