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.
Causes. 1  Kissing, hugging or close contact with a person who has fever blisters. 2  Through indirect contact, like sharing a towel/handkerchief or lip balm of the infected person. 3  Virus can easily spread through cuts or bruises on the skin. 4  Cosmetic surgery. 5  Lip injury. 6  Dental treatment. 7  Stress. 8  Hormonal changes.