To detect a difference of one standard deviation in the range between the groups (laser and microneedling), with a power of 90% and an α error ≤ 0.05, 23 patients are required for each group. Data will be inserted in Excel and then exported to SPSS v18.0 for statistical analysis. Quantitative variables will be analyzed by mean and standard deviation and the groups will be compared by Student's t test for independent samples. To compare the variation of the measurements between the groups throughout the sessions the analysis of variance for repeated measures will be used. For the analysis of interobserver agreement the intraclass correlation coefficient and the Bland - Altman method will be used.