[THE RATIONALE FOR THE POSSIBLE ROLE OF DEMODEX FOLLICULORUM IN THE PATHOGENESIS OF ROSACEA]

The purpose of the study was to study the frequency of detection and population density of the mite in rosacea patients depending on the clinical form, the location of the morphological elements on the face and some parameters of the functional state of the skin. We observed 55 patients (38 women and 17 men) aged from 30 to 65 years old with disease duration from 6 months to 10 years. According to clinical forms, 35 had PPR and 20 - ETR (erythematous - telangiectatic rosacea). By location of the rash elements, the following types are distinguished: central, medial, asymmetric, lateral, and total. The mite was identified by a microscopic method. The functions of the skin barrier of the face skin: moisture, oiliness, dryness were determined using a bio-impedance analyzer (BIA). As shown by the results of the study of the above parameters in the observed patients, a high density of the mite population (> 5 per cm2) was noted in cases of total, medial and central type of their location. This indicator was in direct correlation with parameters such as skin fat content and moisture. 75% of patients in this group were diagnosed with PPR. In the group of patients with medium and low population density of mites (<5 per cm2), the lateral, asymmetric and central type of their location were dominated in 65% ​​of patients with ETNR. This group of patients showed low levels of skin fat and moisture, relatively high rates of dryness. Thus, the population density of the mites is dependent on the intensity of the anatomical location of the sebaceous glands of the face skin. An analysis of the results obtained in the study of the role of mite in the pathogenesis of rosacea led us to the conclusion: in rosacea patients, a correlation was found between the increase in the population density of mites, the type of element arrangement and the severity of dermatosis, which proves the role of the mite as one of the most frequent but not obligatory pathogenetic factors in the development of this dermatosis, especially its papulopustular form.