The appearance of bruises on the body is mainly caused by the following reasons: 1. The rupture of subcutaneous capillaries after bumping, resulting in bruising and painful pressure, the bruises can disappear on their own in about a week. If you want the bruises to subside sooner, you can use a hot towel on the affected area 24 hours after the bump to promote local blood circulation to help recovery. 2, taking a certain drug or infection, so that the function of platelets is affected, blood does not easily coagulate, resulting in the appearance of bruises on the skin or hemophilia, the body coagulation dysfunction, the number of coagulation factors reduced. The patient needs to actively treat the original disease, and the cyanosis on the body can subside after the original disease is cured.3. The cyanotic birthmark of varying size on the waist or buttocks of a newly born baby is a normal physiological phenomenon that has no effect on the baby’s health. This is a normal physiological phenomenon that has no effect on the baby’s health. It will gradually disappear with age, and will fade away completely without special treatment around the age of two.