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.
Blood blisters can be caused due to constant rubbing of the skin which is often caused for baseball pitchers. It can occur when sharp tool tears the skin. Frostbite can also cause blisters on the skin. Symptoms : Blood blisters are seen mostly on the hands or feet when the skin is injured or cracked. It is the collection of serum fluid in the damaged area of the skin. It may or may not cause pain. In case of infection, blood blisters turn red in color with moderate swelling.