Tranexamic acid is an anti-fibrinolytic enzyme, which can be used externally or orally to get rid of spots to a certain extent, but oral use has the risk of causing coagulation dysfunction and is generally not recommended. As an anti-fibrinolytic enzyme, tranexamic acid can protect fibrin from being degraded and dissolved by fibrinolytic enzymes to achieve the effect of hemostasis, and is commonly used for all kinds of hemorrhage caused by primary hyperfibrinolysis. Tranexamic acid has definite curative effect on melasma, but it is not recommended that patients choose tranexamic acid because of whitening. Tranexamic acid should be used under the guidance of a medical professional. Adverse reactions such as diarrhea, nausea, vomiting, and occasionally intracranial thrombosis and bleeding due to drug overdose can occur. Tranexamic acid is contraindicated in patients who are allergic to tranexamic acid and in patients who are using thrombin.