I have been vaping since Nov 17th and have used plenty of PG and VG heavy mixes. Just this week I have been getting rashes up and down my arms, hands, chest, back and behind my knees. Its been itching like mad and I first thought maybe I got some bad spider bites from falling asleep in the basement. I ended up cleaning my whole basement and even went as far as steam clean my furniture. The rashes havent gone away for 3 days and just going to take some benedryl right now for it. Is it possible to find out your allergic to something even after 3 months of no symptoms until now?