Blood blisters should be allowed to heal on their own. Blood and friction blisters normally heal in one to two weeks. They heal because new skin grows behind the elevated layer of the blister. The fluids in the blister will dry out over a period of days or weeks. If the skin is torn, then the healing process may take longer. However, if the injury is severe or recurrent, then the skin might not have time to heal before more damage occurs. This could lead to scarring and chronic pain. Also, if the blister contains chemicals or metals, they may remain in the body after the skin has healed. These substances can cause serious health problems if they are not removed soon after an injury. Your doctor may need to remove the blister after it has healed or use a biopsy tool to get samples of the material inside the blister. Some people develop scars instead of skin when they bleed severely from a wound. The scars may be white or dark brown and may feel tight or stiff. They can be very painful and may recur if not treated properly. A doctor can treat bleeding scars by applying ice packs or cold compresses to them for several minutes at a time, several times a day. This slows down the flow of blood and helps the skin turn red and swell, which makes the scar look better and feel better too.