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Cold Sore- also known as fever blister
Cols sores are painful, fluid-filled tiny blisters that appear on the lips and around the nose. They usually appear in association with a cold-hence the name. It is caused by one of two highly contagious viruses:Herpes simplex virus type 1 and type 2. When the body is stressed, or its immune system is compromised, the body becomes an easy attack of this virus.
When you have it, avoid irritating it further with acidic or salty food.
There are a lot of over-the-counter painkillers like any of these generic names: Aspirin, Ibuprofen, and Paracetamol.

Benzocaine is a kind of anesthetic agent, and using creams with benzocaine greatly eases the pain from cold sores. 

Herpes simplex virus is very contagious. Avoid using the same cups, plates, towels, with others and avoid skin-to-skin contact.