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I also am getting early impetigo around my mouth (yeah, pretty) - for me this happens only when my stress levels are hitting fairly big highs (ok, really big highs). My holiday was pretty stressful, won't bore you with the details but this and giving up smoking seem to have put my body in a stressed state. Adding vigorous exercise to this and some heavy-ish lifting seems to have caused my symptoms. I'm guessing here of course but with the onset of impetigo stress must be a factor.
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Is your "impetigo" painful?
Impetigo typically results from bacterial infection and is not directly associated with stress. OTOH, cold sores which are related herpes zoster can be triggered by stress. These lesions resemble impetigo but are usually painful.
If it is zoster, it may be complicating your pain presentation.