If the patient has bruises on the forehead, it is often due to the following reasons: 1, high blood pressure: because when the blood pressure is too high, it will lead to the obvious expansion of blood vessels, so you need to check the blood pressure to clarify, if it is indeed caused by high blood pressure, you need to go to the cardiology department of the hospital as soon as possible for medication. 2, varicose veins: there are many reasons that cause varicose veins, such as primary or secondary factors, when the condition is not heavy, you need to go to the hospital for regular review. 3.Venous thrombosis: forehead with bruises, most commonly due to venous thrombosis, need to go to the hospital to check the blood routine, coagulation five, vascular ultrasound for clarification. If it is the disease, it needs to be dilated, dispel aggregation, anticoagulation and other treatments, and if necessary, thrombolytic therapy and interventional therapy. During the treatment period, alcohol should be avoided and spicy food should not be eaten.