A blood blister is one that forms below the epidermis when blood and tissues in the dermis are damaged. They are formed because of a sudden compression and not continuous friction as in other types of blisters.
The epidermis in this case remains undamaged and lymph, blood and other bodily fluids which comprise this blister are trapped beneath it.
Sometimes this mixture of liquid is completely isolated and after a period of time begins to thicken and form a pasty substance. Blood blisters are usually because of accidents and the most common places are on the hands and feet.
The difference between blood blisters and other types of blisters is that the former contains only blood, lymph and body fluids unlike other blisters that may be filled with a colorless liquid or even pus. The latter arise due to other reasons which could also be the causes of skin, bacterial or viral infections. Blood blisters could also arise because of frostbite and constant abrasion.
Blood blisters should be left alone and as far as possible the epidermis should not be punctured to drain out the fluid. Such an action might lead to infection. If there is severe discomfort, the area where the blister is should be raised and a cold pack applied to alleviate the pain. Soaking in a solution of Epsom salts will control the swelling. If required the area may be bandaged. If other symptoms occur such as inflammation and redness around the wound, fever or excessive pain, it is advisable to visit the doctor as this may be symptomatic of some other underlying problem. If the blister breaks on its own, the area may be disinfected and treated with Neosporin or some other such medication.
Blood blisters and viral infections are usually not interconnected but a ruptured blister can be an entry point for a virus. And this could lead to a viral infection at the site of the blood blister and the infection may then spread to the rest of the body.
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