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The chest is a photoexposed area that shows e ects of photodamage. Microneedling is a safe option for the rejuvenation of this area, also leading to improvement in dyschromias. Objective: To evaluate histologic cutaneous response after three monthly sessions of microneedling for the treatment of dyschromias on the chest. Methods: Three monthly sessions of microneedling, with 1.5mm length needles were performed, as well as skin biopsies before and 90 days after commencement of the study. Histologic samples were evaluated with H&E and Fontana-Masson stains. Melanin content was measured based on dermal clusters. Results: Six patients between 38 and 67 years of age, phototypes II-III, Glogau scale II-IV were included. A positive correlation was observed between the time and dermal content of melanin (p= 0.029): three sessions of microneedling reduced this content on D90 compared to the beginning (6.4 ± 1.7 MC on D0 versus 3.1 ± 0.4 on D90, p = 0.05). Three patients reported global skin im provement on D90. Conclusions: The proposed mechanism of microneedling to promote lightening includes fibroblast proliferation and neocollagenesis in the upper dermis. This is the first study to evaluate the histology of the findings associated to lightening of the chest due to microneedling.

Avaliação histológica da redução do conteúdo melânico cutâneo após realização de microagulhamento na região anterior do colo