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.
Infections causes formation of blisters on the mouth, lips, face, genital area and other parts of the body. Such infections includes varicella zoster virus, herpes simplex virus, bullous impetigo and Coxsackie virus that is common in children. Some of the infections are described below: Herpes simplex virus.