Abstract

Folliculitis decalvans is a rare disease of primary cicatricial alopecias, about 11% of all alopecias of this group. Dermatosis was first described by the French dermatologist Charles-Eugne Quinquaud in 1888 and 1889. In recent decades, the number of publications devoted to the etiopathogenesis, clinical and histological characteristics, as well as approaches to the treatment of folliculitis decalvans has increased.
 The article presents the results of data analysis on the databases Scopus, Web of Science, MedLine, The Cochrane Library, EMBASE, Global Health, CyberLeninka, RSCI.
 The etiopathogenesis of the disease is still unknown. The role of seborrhea and skin colonization by Staphylococcus aureus, as well as impaired local immune response and the presence of a genetic predisposition, have previously been discussed. Folliculitis decalvans is now thought to be a result of persistent disruption of the skin barrier that predisposes to subepidermal invasion by opportunistic microorganisms, including Staphylococcus aureus. Clinical, dermatoscopic (trichoscopic) and histological characteristics of dermatosis are being specified. Its characteristic clinical features are a persistent progressive course, the formation of alopecia foci with a rich red edge, pustules and crusts along the periphery of the alopecia foci, polytrichia and the formation of a dense scar that rises above the surrounding skin. Dermatoscopic characteristics depend on the intensity of the inflammatory process. Specific trichoscopic signs of the disease include follicular pustules, yellow tubular desquamation, yellow crusts, perifollicular erythema, perifollicular hemorrhages, and fine tortuous vessels. Depending on the number of these signs, the degree of inflammation is determined. Histological features of the disease include a massive perifollicular infiltrate, the formation of gaps between the epithelium of the follicles and the surrounding stroma, and in the final stages of the process ― fibrous tracts, diffuse fibrosis in the dermis.
 The treatment of folliculitis decalvans are antibacterial drugs, it is also possible to treat with courses of topical corticosteroids, antiseptic solutions.
 We assume that the systematization of information about the etiopathogenesis and approaches to the diagnosis and treatment of folliculitis decalvans will improve the diagnosis among other primary cicatricial alopecia and the choice of the tactics of treating folliculitis decalvans.

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