LEA PATERSON / SCIENCE PHOTO LIBRARY LEA PATERSON / SCIENCE PHOTO LIBRARY
Developing a cold sore, conceptual image. Woman touching her lower lip. A tingling or burning sensation in this region could indicate the development of a new cold sore. Cold sores are painful skin blisters caused by the Herpes simplex virus. Anti-viral medication such as aciclovir can reduce the severity of the symptoms.
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