HSV 1: Blister on the lip suggests previous exposure to the herpes virus that manifests itself for the first time, it seems. Pregnancy is a state of altered immunology, which could have contributed to the herpes flare up. It may be a good idea to do a blood test for HSV 1 and HSV 2. HSV 1 used to cause cold sores (labial herpes) HSV 2 genital herpes,
Answered 2/8/2015
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