This article examines the role of the scalp microbiome in the pathogenesis of dermatological conditions (seborrhea, dandruff, and various forms of alopecia) and assesses the impact of modern hairdressing procedures on the scalp ecosystem. The study aims to identify stable correlations between disruptions to the scalp microbiota and the use of invasive cosmetic procedures, as well as to systematize approaches to their diagnosis in trichological and dermatological practice. To achieve this goal, we utilize theoretical, legal, and natural-scientific analyses of recent publications, as well as methods for systematizing and critically interpreting empirical data presented in clinical and experimental studies. The concluding section substantiates the need to integrate new-generation tests aimed at assessing the state of the microbiome, the barrier function of the epidermis, and the acid-base balance of the scalp into professional hairdressing and trichological diagnostic protocols, as well as the development of personalized programs for restoring the microbiota after chemical procedures. The findings and proposed approaches have practical implications for trichologists, hairdressing technologists working with highly aggressive formulations, and dermatologists dealing with secondary dermatoses induced by cosmetic procedures.

scalp microbiome, seborrheic dermatitis, alopecia, hair coloring chemistry, disulfide bonds, hair diagnostics, Malassezia, pH balance, hair reconstruction, scalp dysbiosis

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