Commute 45 to 59 min. 7.20%. Commute greater than 60 min.
1 Oral Ulcers: Usually, an ulcer is referred to as an open wound which is formed inside the mouth and this occurs due to the invasion of micro organisms. 2  Sometimes, blood blisters are caused due to the skin infections caused as a side effect of medications. 3  Ulcers are of two types they are: Canker sores and Cold sores.
Canker sore is a type of ulcers that causes the formation of blood blister in mouth. They are formed after the invasion on microorganisms in the mouth. They may occur on the various parts of the mouth such as under the tongue, inside cheeks and on gums. There are various drug that causes blood blisters.