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 sores can be caused by trauma such as biting your cheek, jabbing your gum with your toothbrush or even overzealous tooth cleaning. The following can also play a role in developing canker sores: A dental or orthodontic appliance rubbing against the cheek. Genetics.