Blood blisters form when damage occurs to the blood vessels and tissues beneath the skin, but the skin remains unbroken. Blood, lymph, and other bodily fluids flow from these regions, filling a small pocket of skin. Blood blisters can range from annoying to extremely painful depending on their size and cause.
Many people develop blood blisters when tools, mechanisms, or weights pinch their skin. They may also occur during forcible human contact, such as grappling or wrestling. Frequent rubbing of skin against an object can also cause blood blisters. Because of this, rowers, drummers, and baseball pitchers have higher risks of blood blisters. Certain conditions, such as frostbite, also include blood blisters among their possible symptoms.
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