Clean your ear and earring with the cleaning stuff AND DONT TOUCH AFTER WITH YOUR HANDS .. If it's still happening you need to get gold backing earrings you're allergic to the other materials. I can't wear any fake earrings or jewelry
It's not water, it's fluid, like the fluid under a blister.
Take the earrings out and clean the holes really well. Give your ears a few hours of rest, perhaps throughout the school day. When you come home, clean them really well again, and put the earrings back in.