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herpes labialis
Herpes labialis (also called cold sores, fever blisters,〔"Cold sores, sometimes called fever blisters, are groups of small blisters on the lip and around the mouth." WebMD, Cold sores - topic overview: http://www.webmd.com/skin-problems-and-treatments/tc/cold-sores-topic-overview〕 herpes simplex labialis,〔 recurrent herpes labialis,〔 or orolabial herpes) is a type of herpes simplex occurring on the lip, i.e. an infection caused by herpes simplex virus (HSV). An outbreak typically causes small blisters or sores on or around the mouth. The sores typically heal within 2–3 weeks, but the herpes virus remains dormant in the facial nerves, following orofacial infection, periodically reactivating (in symptomatic people) to create sores in the same area of the mouth or face at the site of the original infection.
Cold sore has a frequency that varies from rare episodes to 12 or more recurrences per year. People with the condition typically experience one to three attacks each year. The frequency and severity of outbreaks generally decreases over time.
==Definitions==
In medical contexts, "labia" is a general term for "lip"; "herpes labialis" does not refer to the labia of the genitals, though the etymology is the same. When the viral infection affects both face and mouth, the broader term "orofacial herpes" is used to describe the condition, whereas the term "herpetic stomatitis" is used to specifically describe infection of the mouth; "stomatitis" is derived from the Greek word stoma that means "mouth".
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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