Treatment of bruises on the knee depends on the specific symptoms. If the bruise does not affect the movement of the knee joint, it is usually due to damage to the subcutaneous tissues, resulting in the formation of localized bruises, which are absorbed during the process. In this case, a warm water bag can be applied to increase blood circulation and promote the absorption of the bruise, which will be absorbed by the body and will not aggravate the situation and gradually improve. If the knee has significant pain and is not moving well, there may be damage to the intra-articular tissues and it is best to have an MRI of the knee to see where the damage is. If there is a fracture, external fixation in a cast or surgical internal fixation with an incision should be performed. If there is damage to the meniscus, it is usually fixed with a brace or plaster cast or minimally invasive knee surgery. If there is damage to the cruciate ligament, external fixation in a cast or reconstructive surgery of the cruciate ligament may also be performed. This is the only way to provide targeted treatment and not just treat the bruise, which can lead to aggravation and miss the best time to treat the condition.