A pinch on the forehead will have blood marks, may be physiological reasons such as excessive force, usually do not need special treatment. It may also be due to diseases such as hives and other diseases, it is recommended that timely treatment. 1. Physiological reasons: in the pinch forehead if excessive force or pinch too long will lead to subcutaneous capillary rupture, thus causing the phenomenon of blood marks, which is a natural physiological reaction, generally do not need special treatment, can be naturally absorbed. 2. Disease causes: If you suffer from urticaria and other diseases, in the external stimulus, will lead to mast cells release vasoactive mediators, thus appearing immune perversion reaction, resulting in increased vascular permeability, under pressure easy to appear blood, it is recommended to go to the hospital in time to do the examination. If the forehead will have a pinch of blood marks symptoms are serious, or symptoms continue and have not improved, should promptly go to the hospital for treatment.