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A blood blister is very similar to a regular, clear blister but is basically filled with blood. The appearance of blood makes them much more noticeable and also lead to the affected people thinking that they are more serious than the more commonly seen blisters.

Blood blisters may be seen on the skin of any part of the body but there are some parts which are more commonly affected than others. The hands, feet, thighs, mouth, fingers, joints, and anywhere there is a bony protuberance are all areas that can be affected by the formation of blood blisters.

Causes of blood blisters

Blood blisters outside the mouth are caused in areas where there is plenty of skin that gets pinched but does not break or get cut. A sudden blunt trauma as caused by a finger getting stuck in a drawer, pressure spots during physical exertions, or other such injuries are the common reasons behind the formation of a blood blister.

Other causes include shoes that pinch the feet, a tight belt or piece of clothing that rubs repeatedly against the skin, repeated friction in an area where there is a lot of sweat as well, and frostbite.

Blood blisters caused in the mouth are much more serious. They could indicate the presence of mouth cancer, a lack of proper nutrition, a bleeding disorder which may have been undiagnosed till then, an allergy, or excessive intake of alcohol which could have affected the liver function.

Treatment of blood blisters

In most cases, there is no treatment that is required for blood blisters. They just need to be left alone and protected from any further injury. Blood blisters should not be popped or deliberately drained without medical supervision because there is a chance of an infection occurring.

The offending cause behind the occurrence of the blood blister should be identified and corrected. If there is a tight shoe or an article of clothing that is pinching the skin then avoid using those altogether. If you are an athlete or a workman then maybe wearing some protective covering on the affected area is something that can be done to prevent the blood blisters from getting injured or recurring again.

If there is some pain or soreness associated with the blister then taking an over the counter pain medication is recommended. If, however, the pain is very severe and not subsiding even after taking the painkillers then it is time to see a medical professional.

The appearance of multiple blood blisters, blisters that appear infected or warm, blisters on the eyelids or somewhere else that affects normal functioning should also be examined by a medical professional at the earliest.   


Blood blisters are almost always harmless and no different from regular blisters. They heal on their own without any intervention necessary. Some over the counter medication for symptomatic relief may be all that is required. The only time a medical opinion is advisable if the blood blister appears to be painful, infected, or maybe something else.

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