I had the best kiting sesh last Sunday at wello on a 12m m80, and wlf with bindings

A straight 3.5 hours kiting and an absolutely perfect day! 17-23 knots [}:)]...
I had my first jellyfish sting then also lol... I didn't know what it was at first- It stung a fair bit, but I just contined on kiting for about 1 hour when I changed to the wlf, and noticed a red, raised area where it was stining and itching a bit (about 4 or so centimetres in diameter). I just left it and kept on kiting because it stopped itching and wasn't sore at all... It started to look like a bruise which was red and raised also, however, now six days later it's starting to get a little itchy; is still the same size, but it has small, red, raised lumps in the same spot... Apart from applying aloe vera gel to it to stop it from itching, is it normal for this to be itchy six days after this occoured, and to still be red and raised bumps>? If it was concerning me I would contact a doctor, but as it isn't severe, I have not done so.
Just concerned and wonering if this is common after a jellyfish sting, if that's what it was, and also what should be applied to the area if a severe sting has occoured? (for future reference).
Many Thanks guys

ps. sorry if this topic has already been addressed, however I did a forum search, and wasn't able to find anything on it.