A typical blood blister appears as a raised, bubble-like spot beneath the skin. It may look dark red, purple, or even black depending on how much blood collects under the surface. The area might feel tender, slightly swollen, or painful when pressure is applied. In most cases, the blister will gradually dry out and heal within one to two weeks without medical treatment.
It is usually best not to pop a blood blister. The skin covering it acts as a natural barrier that protects the wound from infection. If the blister bursts on its own, the area should be gently cleaned with soap and water, treated with an antiseptic, and covered with a clean bandage to keep it protected while it heals.
