Diode Laser ۸۰۵ Hair Removal Side Effects in Groups of Various Ethnicities – Cohort Study Results

Abstract Introduction: As hair removal has become most popular in aesthetics, the management of its side effects is crucial for every practitioner. Available studies describe the effectiveness of the diode laser hair removal for all skin types according to the Fitzpatrick scale independently, but the question of the occurrence of side effects and adverse effects remains unanswered. This study aims to illustrate aspects of side effects for patients of various ethnicities and the impact of those on the effectiveness of the treatment.Methods: The research was carried out in Poland and the United Kingdom from March ۲۰۱۶ to March ۲۰۱۹. ۲۱۷ people of various ethnic origins were qualified for the study, ۲۰۶ sessions were completed and statistical analysis was performed. The procedure was performed in the pubic area with diode lasers with a wavelength of ۸۰۵ nm, minimum peak power of ۲۱۰۰ W and pulse duration between ۱۵ and ۴۰۰ ms. ET sapphire cooling assisted handle ۹ x ۹ mm large and pulse energy density between ۱۰ and ۱۰۰ J/cm۲ were used for all treatments. In addition, in order to illustrate the effectiveness of treatments, the subjective and objective analyses of hair loss percentages were indicated. In statistical analysis, the chi-square test for independence was used to evaluate the correlation between the type and severity of side effects and the ethnic origin of patients, the number of treatments, the Fitzpatrick scale and the level of satisfaction.Results: The occurrence of sensitivity depended statistically significantly (P = ۰.۰۰۲) on ethnicity. Ethnicity had no significant effect on the occurrence of erythema. The occurrence of hyperpigmentation statistically significantly depended (P < ۰.۰۰۱) on ethnicity. The occurrence of burns depended statistically significantly (P = ۰.۰۰۱) on ethnicity. The number of treatments had a significant (P = ۰.۰۱۲) effect on the severity of side effects occurrence. Among participants who had ۶ treatments, only half had side effects, including multiple effects occurring in ۹.۷۹% of cases. The occurrence of side effects such as sensitivity and hyperpigmentation did not depend on the number of treatments. However, the number of treatments had a significant impact on the incidence of erythema (P < ۰.۰۰۱) and burns (P = ۰.۰۰۵). More than half of the respondents (۵۸.۳۳%) had erythema after more than six procedures, whereas in the ۶ treatments the erythema occurred only in ۶.۷% of cases.Conclusion: The treatment with the use of diode lasers for all subjects with different ethnicity and thus the recognized scale according to Fitzpatrick is effective and safe. The occurring side effects are transient and do not impact the effect of the whole therapy. Keywords: Side effects Epilation Diode laser Ethnicity Hair removal