Blood blisters can look alarming when they suddenly appear on the skin. They usually show up as dark red, maroon, or purplish bubbles beneath the surface and may cause mild discomfort or tenderness. Despite their dramatic appearance, most blood blisters are harmless and heal on their own within a short time. They form when tiny blood vessels under the skin break while the top layer of skin remains intact. The leaked blood becomes trapped underneath, creating a raised blister filled with dark fluid. Blood blisters most often appear on the fingers, palms, toes, and soles of the feet, but they...
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