While blood blisters can happen to anyone, they are most common in active people (such as athletes or dancers) and individuals who wear shoes that don’t fit their feet properly. People who have jobs and hobbies that involve manual labor are also at risk of developing blood blisters.
Some of the reasons a person may get blood blisters are as follows:
- The skin is pinched and doesn’t break open.
- The skin is exposed to a high amount of friction, such as when walking, lifting weights, or using a tool.
- Poorly fitted shoes cause excess friction on heels and bony areas of the toes like bunions.
- Feet are more prone to blistering when they are wet—moisture softens the skin and makes it more susceptible to friction.
- Frostbite might lead to blood blisters.
- People with certain diseases, like kidney failure, may experience blood blisters in the mouth, according to the Indian Journal of Dermatology.
- People taking certain medications, such as blood-thinners, may be more at risk of developing blood blisters.
If you have an unexplained blood blister in your mouth, see your healthcare provider as soon as possible to rule out more concerning causes.
Oral blisters can be brought on by a range of factors, such as an injury from hot food, dental work, and endoscopy procedures. But they can also occur due to serious diseases like rheumatoid arthritis, diabetes, high blood pressure, and, as previously mentioned, kidney failure.