A member asked:

Sore appear on the outside of lip unlike canker sores on the inside. what could it be?

A doctor has provided 1 answer

Fever blisters: Fever blisters or cold sores caused by a virus, herpes simplex virus type 1 (hsv-1). Docosanol sold over-the-counter as abreva is reasonably effective when started early in the course of an outbreak.

Answered 10/10/2012

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