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.
A number of medical conditions may cause blisters. The most common are: 1  chickenpox â a childhood illness that causes itchy red spots. 2  cold sores â small blisters that develop on the lips or around the mouth, caused by a virus. 3  herpes â a sexually transmitted infection (STI) that most commonly affects the groin.