My teen is allergic to some insect bites and stings. Those he's not allergic to, he still has an "over-reaction" to what most people do.
Saturday evening he was bit by something. (He thinks a mosquito, and I did find one in his room.) The bite was between the pointy finger and the middle finger. By Sunday night it was red and swollen all the was to the wrist. Itchy as well. The area closest to the bite looked swollen kind of like a blister. (It did not feel like a blister.) But there was liquid seeping out. That's never happened before. It looked like the clear fluid that sometimes seeps from a wound, which I think helps in the healing process. Would it make sense for that from an insect bite?
The only other thing I could think of is the insect venom, but I doubt that. This morning his hand is still swollen. He took antihistamine last night.