Small fluid blisters, mostly seen on the corner of lips are known as fever blisters or cold sores. They are often confused with canker sores but while the latter is usually present inside the mouth, cold sores appear over the skin around the mouth; more commonly over lips. They are caused due to HSV 1 infection and are highly contagious.
Cold sores can spread to other body parts such as the nose and sometimes genitalia, though they usually don’t. The best way to differentiate a cold sore is that it is usually associated with symptoms such as fever, nausea, headache, sore throat, swollen glands and dehydration.
According to an estimate, about eighty percent people experience this virus attack at least once in their lifetime.
Cold sores usually start with a tingling and itchy sensation after which the blister appears. Fortunately, it is a self-limiting condition and the blister vanishes itself in approx two weeks without leaving any scar. However, you can certainly hasten the healing process by using some simple non-invasive remedies.