Blood blisters are a common, minor skin condition. A blood blister is marked by a raised section of skin filled with blood. They are very similar to blisters caused from friction that fill with a clear liquid. In this article, we examine what blood blisters look like, what causes them, and what someone can and should do if they develop one.
Blood blisters: Causes, diagnosis, and treatment
Back to Health A to Z. Blisters often heal on their own within a week. They can be painful while they heal, but you will not usually need to see a GP. To protect your blister from becoming infected, a pharmacist can recommend a plaster or dressing to cover it while it heals.
What to Do [and Not Do] for Treating a Blood Blister
In some cases, however, a simple blister can instead become a blood blister. A blood blister is essentially a common blister, but the blood vessels beneath the blister have been damaged. This causes blood to leak within, often turning the blister a dark red or purplish color. Blood blisters on the foot can appear in any area under excess pressure and friction. They most often form in bony areas, but can develop in softer areas as well.
We include products we think are useful for our readers. If you buy through links on this page, we may earn a small commission. These blisters are not much different than ones that have clear fluid inside of them. For the most part, they are harmless and will go away within a few weeks without treatment.