A bruise forms when a blow breaks blood vessels near your skin's surface, allowing a small amount of blood to leak into the tissues under your skin. The trapped blood appears as a black-and-blue mark.
If your skin isn't broken, you don't need a bandage, but you enhance bruise healing with these simple techniques:
Elevate the injured area.
Apply ice or a cold pack several times a day for a day or two after the injury.
Rest the bruised area, if possible.
Consider acetaminophen (Tylenol, others) for pain relief, or ibuprofen (Advil, Motrin, others) for pain relief and to reduce swelling.
See your doctor if:
You have unusually large or painful bruises — particularly if your bruises seem to develop for no known reasons.
You begin to bruise easily.
You're experiencing abnormal bleeding elsewhere, such as from your nose or gums, or you notice blood in your eyes, stool or urine.
You have no history of bruising, but suddenly experience bruises.
These signs and symptoms may indicate a more serious problem, such as a blood-clotting problem or blood-related disease. Bruises accompanied by persistent pain or headache also may indicate a more serious underlying illness and require medical attention.