Terra firma-forme dermatosis (TFFD) belongs to the group of dirty-like dermatoses. The disease was described in 1987, but the etiology and pathogenesis are still insufficiently understood. The true incidence and prevalence of TFFD isn`t clear, there are few publications devoted to this disease. TFFD is clinically manifested by rashes that visually resemble dirt, which can persist for a long time despite the patient's compliance with hygiene standards. There are separate reports on the connection of TFFD with other skin diseases, as well as somatic pathology and malignant neoplasms. The article provides a review of the literature demonstrate two clinical cases of TFFD in children from the same family, draws attention to the development of TFFD after suffering a new coronavirus infection. The article is of interest to dermatovenerologists, family doctors and pediatricians.

The article presents epidemiological data, age-related characteristics of hair and scalp diseases in children, and presents clinical cases with typical and rare dermatoses of this localization.