I was playing with my two day old Plymouth Rock chicks this evening and noticed one has a badly swollen foot. I examined the foot and it is red and swollen around the toes and ankle, with what looks like some sort of a bite wound from an insect maybe. The chick seems slightly sleepy, but otherwise ok, walking fine and playing with its siblings. The chicks are in a brooder in my bathroom, with a lid over them that has air holes in it. (plastic storage tote) We have a big problem with ants, spiders, and scorpions, among other bugs. I've never seen an issue like this though...I did not find any bug in the brooder when I cleaned it out to check, so it could have come in, did its thing, then left. I think if it was a scorpion, the chick would have died quickly, so it was most likely something else. The chick was fine at 4 this morning when I checked them last. Any ideas on how to try treating it, or just wait and see?