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A member asked:
What are the causes of lip blisters ?
A doctor has provided 1 answer
Allergy or Infection: There are many etiologies for lip blisters. Herpes simplex labialis affects many individuals and is due to a recurrent virus infection. It may be induced by stress, sunlight, and an underlying illness. Other causes include an allergy to a cosmetic ingredient. Systemic medications can also be associated with lip blisters.
Answered 1/3/2018
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