A bruise on the body caused by an external impact, manifested by bleeding and oozing in the subcutaneous or muscular tissue, caused by the leakage of tissue fluid around it. At first, the bruises and lumps under the skin may slowly turn into bruises under the skin. At the beginning, ice should be applied to the surface to reduce the bleeding and tissue fluid leakage under the skin, and the lump will be smaller. If the bruise needs to be removed as soon as possible after a day, hot towels or hot baths or hot tubs should be used. The purpose is to accelerate the blood circulation of the subcutaneous tissue, which can eliminate the bruise faster.