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.
Frostbite: If you live is a very cold region, you may sustain frostbites. Frostbites may result in mouth injuries that may cause blood blisters in on gums, cheeks and lips. Usually, these blood blisters appear two days after suffering a frostbite. Frostbites may cause both flat blood blisters or raised blood blisters.