WebMD indicates that blood blisters occur when the skin is pinched in a forceful manner and blood vessels are damaged in the process. A common injury that is known to create blood blisters is pinching a finger in a drawe... More » Health Conditions & Diseases

Blood blisters should be left alone and be allowed to heal on their own unless it is too large and painful, in which case it would be better to drain it with care. A blister should not be drained if the person has HIV, ... More » Health Conditions & Diseases Skin Conditions

If the blood blister isn't too painful, try to keep it intact, says Mayo Clinic. Cover the blister with a bandage, and seek medical attention if it is painful or if it prevents you from walking or using your hands. More » Health Conditions & Diseases Skin Conditions
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