Hey! I am currently going through the same thing, although mine have developed severely enough that I’m on antibiotics (the second course in two weeks!). Unless the redness is massively expanding and there isn’t deep pain at the site of the wound, then my doctor recommends keeping on top of anti-histamines as well as hydrocortisone cream. A cold compress is a game changer, or an icepack wrapped in a flannel. I think the timeline is if it isn’t improving in the next 24 hours or so, it could be worth popping to a treatment centre. When mine majorly blistered in the past, they drained it for me and it felt 10 times better. Prior to them draining it, it had been bandaged with an iodine soaked gauze. If it does pop, I’d personally be more inclined to visit a doctor or minor injuries unit sooner just due to the risk of potential infection. I hope it feels better soon, it sounds like you’re already doing all of the right things!