CLINICAL INVESTIGATION TO EVALUATE THE EFFICACY AND SAFETY OF EPILADY PROTOTYPE DEVICE FOLLOWED BY APPLICATION OF A TOPICAL FORMULA ON DEPIGMENTATION OF LENTIGO SPOTS

Rational The investigational product in this clinical investigation, the Epilady laser-based device, applies the principle of selective photothermolysis to target melanin within pigmented lesions. It uses diode laser technology at either 660 nm or 808 nm, selected according to the participant's skin phototype, and is equipped with a camera-guided targeting system and integrated safety sensors for precise and controlled energy delivery. The device has been classified as a Class IIb medical device in the EU, intended for the permanent reduction of pigmentation such as lentigines. Design: This is a prospective, open-label, randomized, intra-individual controlled clinical investigation conducted in healthy female participants aged 35 to 70 years. The clinical investigation is designed to evaluate the efficacy and safety of the Epilady prototype laser medical device, used alone or in combination with a cosmetic depigmenting formula, in reducing the pigmentation of lentigo spots on the hands and lower forearms. Following inclusion, the left and right hands (or forearms) of each participant will be randomized: * One side will receive weekly laser treatments with the device alone, while * The contralateral side will receive weekly laser treatments with the device followed by twice-daily application of the cosmetic formula starting 24 hours after each laser session and continuing for the remainder of the 84-day period. Reglementation The clinical investigation will be conducted in compliance with Good Clinical Practice (GCP) guidelines and applicable regulatory requirements for medical device investigations, ISO 14155. Objectifs \& Statistiques Safety analyses will be performed on the SS population, while efficacy analyses will be primarily performed on the ITT population. If the sample size between the PP and ITT populations differs by more than 10%, the efficacy analysis will also be performed on the PP population. Pigmentation intensity by L'Oréal color chart: The score of the "balance of red/yellow" will be coded as follows: * G (red): a score of 7 will be attributed * H: a score of 6 will be attributed * I: a score of 5 will be attributed * J: a score of 4 will be attributed * K: a score of 3 will be attributed * L: a score of 2 will be attributed * M (yellow): a score of 1 will be attributed Thus, a decrease in the score from D0 onwards, will indicate a change of skin colour from red to yellow. The change in red/yellow component \[letters G (red tendency) to M (yellow tendency)\] will be added to the change in lightness \[numbers 19 (dark skin) to 5 (fair skin)\] for analysis purposes, e.g. a change from G18 to J15 will correspond to a change of -6 units. On each assessed area separately (lentigo spot and adjacent) and each side, the significance of the change from baseline will be assessed using a one sample t-test (versus 0, which would indicate no change). The assessment of the change from baseline on each side will be assessed using a Paired Samples t-test or the Wilcoxon Signed Ranked, depending on the normality of the data. Similarly, the comparison of the two sides will be assessed using the same statistical tests. The normality of the data will be tested at 1% of the Shapiro Wilk test. Lentigines Global Improvement Scale (LGIS): At each visit, the comparison of the two treatments will be investigated using a Wilcoxon Signed Rank test. Self-assessment efficacy questionnaires: The answers to the efficacy questionnaire will be summarized in a frequency table by category, together with 100% stacked bar charts. Safety assessment: AEs will be listed by participants including time of onset, time from the first administration of clinical investigation drug, duration, intensity, action taken, corrective therapies, outcome, relationship to clinical investigation drug and seriousness. Local tolerance will be reported descriptively. For the comparison of treatments, the null and alternative hypotheses are as follows: H0: There is no difference between the two treatments H1: There is difference between the two treatments To claim superiority of the device + cosmetic formula, the null hypothesis should be rejected, and the average score should be in favor of the device + cosmetic formula. Significance level :The null hypothesis will generally be rejected if a p-value less than 0.05 (5% significance level) is produced by the statistical procedure.