Charoenwattanayothin A.Saiwichai T.Chaichalotornkul S.Mahidol University2023-06-182023-06-182022-10-01Journal of Cosmetic Dermatology Vol.21 No.10 (2022) , 4515-452214732130https://repository.li.mahidol.ac.th/handle/20.500.14594/85516Background: Acne is a chronic, inflammatory skin disorder of pilosebaceous units. Tranexamic acid (TXA) acts as a plasmin inhibitor to reduce blood loss and is also used to treat rosacea due to its anti-inflammatory effects. Some parts of the pathogenesis of rosacea are similar to inflammatory acne. Objectives: The study aimed to evaluate the efficacy of 10% TXA serum in treating acne and its adverse effects. Methods: A randomized, double-blind, placebo-controlled, split-face study was performed on 18 mild-to-moderate acne patients. Patients applied 10% TXA serum on one side of the face and placebo on another side twice daily for 8 weeks. Acne lesion counts and adverse effects were evaluated every 2 weeks. Results: Significant differences in total inflammatory acne counts were observed between TXA and placebo since Week 4 (p = 0.008). TXA mainly reduced papules and pustules, as papule counts significantly decreased since the 8th week (p = 0.046) and pustule counts significantly reduced since Week 8 (p = 0.033). Moreover, physicians also found that TXA serum reduced the redness of the skin, corresponding with the imaging from VISIA® Skin Analysis. The anti-inflammatory effect of TXA resulted in less PIE and PIH. Adverse effects, including erythema and scaling, were treated by applying any moisturizing cream. Conclusion: Topical 10% TXA can reduce inflammatory acne effectively. Adverse effects were minor and treat easily.MedicineArticleSCOPUS10.1111/jocd.149722-s2.0-851297112711473216535388589