herpes is herpes regardless of the location (mouth or genitals). cold sores are herpes. period. impetigo is not (it is caused by a bacteria). herpes antibodies may be detected from contact with someone with herpes anytime in the past. it could be from you or if your wife had previous sexual partners. one of them.
my wife was tested and told she has an std a strain of herpes. i get a cold sore or impetigo once in awhile. is it from me. as a child i was treated for impetigo. but every time i get a sore i just call it a cold sore. i have never been told or tested for herpes but just assumed it was hsv1. my wife went to her doctor not a specialist in sexually transmitted diseases and he told her she has an std specifically a strain of herpes. its it possible that i somehow gave her an std hsv2 maybe even though i don't have hsv2? how could she have an std if i don't. i'm hoping the doctor is wrong.