Blood blisters need to be treated according to the size of the blood blister, the location of the blood blister and other factors. 1. The size of the blood blisters: larger blood blisters caused by external extrusion, generally is sterilized can puncture the blood blisters, and then release the accumulated fluid, or use a sterile syringe to draw out the liquid inside, and then wipe the affected area with alcohol or iodine povidone, bandage, and change the medicine regularly. For smaller blood blisters, can be sterilized without puncture, bandage and regular change of medication, to observe and protect the effect, you can also apply hot compresses to the local area, which can promote local blood circulation and accelerate the subsidence of small blood blisters. 2. The location of the blood blister: If the blood blister occurs in some sensitive parts, such as joints and other moving parts, or venous malformation, hemangiomas and other locations, can not be punctured, puncture is likely to lead to bleeding, there is a risk of difficulty in stopping the bleeding, the need for timely medical attention. If there is a larger blood blister or blood blisters occur in sensitive areas, go to the regular hospital in time, follow the doctor’s instructions for treatment and therapy. Do not blindly operate on your own to avoid serious consequences.