This could be due to trauma, an irritation, or infection. A blood blister forms when subdermal tissues and blood vessels are damaged without piercing the skin. It consists of a pool of lymph, blood and other bodily fluids trapped beneath the skin. Common areas that suffer from blood blisters include the hands and feet. You may apply a cold pack and leave it on its own and it will completely resolve on its own. If it persists, have this evaluated further by your doctor for proper management.
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