Introduction
A blood blister can be startling at first sight—a dark red, purple, or blackish bubble beneath the skin that seems to appear suddenly. In most cases, however, blood blisters are harmless and result from minor injury or friction.
🩹 What Is a Blood Blister?
A blood blister forms when:
Small blood vessels beneath the skin break
Blood becomes trapped under the outer layer of skin
The skin remains intact, creating a raised, fluid-filled area
Unlike a regular blister, which contains clear fluid, a blood blister contains blood.
👟 Common Causes
Blood blisters often develop due to:
Tight or ill-fitting shoes
Repeated rubbing or friction
Pinching or crushing injuries
Sports and physical activity
Accidental impacts
Feet, toes, fingers, and hands are common locations.
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