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.
Answer Wiki. It sounds like a blood blister, which may have been caused by trauma. Perhaps you bit the inside of your cheek. Other causes might be a problem with clotting like low platelets. Smoking and alcohol, as well as certain food allergies can also trigger blood blisters in the mouth. Other, more rare causes exist.