cold sore

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cold sore:

see herpes simplexherpes simplex
, an acute viral infection of the skin characterized by one or more painful, itching blisters filled with clear fluid. It is caused by either of two herpes simplex viruses: Type 1, herpes labialis,
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cold sore

a cluster of blisters at the margin of the lips that sometimes accompanies the common cold, caused by a viral infection