General bruises usually show significant improvement with hot compresses for about 3-5 days. Bruising is usually caused by subcutaneous bleeding, which can occur in daily life if a little carelessness causes injury to the subcutaneous soft tissues. If a bruise occurs on the patient’s body surface, a cold compress should be applied within 24 hours of the appearance of the bruise. Cold compresses can reduce nerve sensitivity and reduce the patient’s pain, and can also cause vasoconstriction and reduce blood leakage from capillaries, thereby controlling swelling and bruising. In the cold compress 24 hours or 48 hours or so can be changed to hot compress, hot compress can use hot water bag or hot towel for 10-15 minutes each time, 3-4 times a day, usually 3-5 days, the local bruise color will gradually become lighter, slowly return to normal color. It is recommended that patients with bruises, in addition to the use of hot and cold compresses for treatment, can also be under the guidance of the doctor to take blood circulation drugs for treatment.