[Alopecia and COVID-19: possible etiopathogenetic variants and therapeutic approach].

Sudden hair thinning, phantom trichalgia in the early and late rehabilitation period after novel coronavirus infection (COVID-19) are the most common complaints of patients, that can be considered by both dermatocosmetologist and medical rehabilitation specialist. A telogen hair loss was found in 19.8% of patients, whereby 27.3% of patients suffering from hair loss during disease and 72.7% - at 3rd-6th month after recovery. Most commonly, hair loss is non-structural and associated with an abnormal ovulatory cycle shift and diffuse asynchronous loss of hair follicles in telogen phase, as well as with an increase of total predisposed to loss hair follicles number. Nevertheless, the analysis of clinical observations of patients with post-COVID hair loss has shown that this disorder is registered not only in telogen phase. There is a rapid disease progression up to the final stages in the presence of verified androgenetic alopecia diagnosis. The cases of alopecia areata and cicatricial alopecia, associated with previous COVID-19, also were registered. Androgenetic alopecia is the first (30.7%) and diffuse alopecia is the second (19.8%) by degree of incidence. The relapses or much less frequently the onsets of alopecia areata and the unexplained pronounced pain at the hair roots in parietal region (7.8%) are in the third place. The article presents in detail the possible reasons and mechanisms of hair loss associated with COVID-19, determines necessary examinations with consideration to the scientific analysis of domestic and foreign literature sources.