Definitely see a dermatologist. I had bad rashes last year, turned into an oozing, burning mess, left scars. Went to Patient First multiple times only to be given shots of some antibiotic and 2 prescription antibiotics. That was a mess, not supposed to do that many antibiotics at once, much less multiple times in row, a couple months apart. Finally they said they did not know what it is, go to a dermatologist.
It turns out my allergies (pollens, saps, perfumes, etc...) had only worsened. Not vape related for me so far. Dermatologist gave me prescription for a steroid based ointment. Every time I get an itch red bump I put it on and it goes away. Dermatologist told me this would happen, and what to do. Also have to shower, wash hair, wash clothes whenever I go outside. So, I just don't go out any more than I have to anymore. Can't leave the windows open in car, apartment anymore either.
It could be you have developed an allergy to something in your liquid that you were not allergic to before. I would at least get some medicine for the current rash, just a cautionary tale of scarring above is why I suggest that. Until then get the best cortisone cream any drugstore near you has.
If you tried any new juice, you probably know the culprit. If not, see a dermatologist.
(Dare I say, the basement story made me wonder about fleas or dreaded bed bugs! Yikes!!)