RESUMO
BACKGROUND: Melasma is an acquired hyperpigmented skin disorder. Tranexamic acid (TXA) prevents ultraviolet radiation induced pigmentation in melasma through interfering with the plasminogen-plasmin pathway. OBJECTIVE: This study was conducted to evaluate the therapeutic effect and safety of TXA by intradermal injection versus TXA with microneedling for melasma treatment. METHODS: Fifty-six female patients with bilateral symmetrical melasma were recruited in a split-face study. All patients received an intradermal injection of TXA on one side of the face, and the other side received TXA with microneedling for 6 sessions at 2 weeks intervals. Clinical efficacy was assessed using a modified Melasma Area Severity Index (mMASI) score at the baseline and after treatment. Global photographs underwent blinded review by 2 dermatologists. Patient self-assessment and satisfaction were recorded. RESULTS: After the treatment, the mMASI score was significantly reduced compared with the baseline in both treated sides (p < .001). No significant difference between both treated sides (p > .05). Patient satisfaction was higher in the microneedling-treated side than the intradermal-injected side (p < .001). No significant adverse effects were observed in both treated sides. CONCLUSION: Intradermal injection and microneedling of TXA could be safe and effective in melasma treatment. Microneedling of TXA was significantly more satisfying to the patients.