What Causes A Blood Blister?

The presence of blood in a blister indicates there is high pressure component.

This high pressure causes deeper injury – injury to small blood vessels in the dermis. Blood then tracks into the epidermis and mixes with the normal blister fluid. That’s why blood blisters often occur over joints and bony prominences: like the back of the heel, the toes and the metatarsal heads (ball of the foot).

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