Hey everyone, I have a 3 month old fancy mouse who I recently found a bump on. They recently had to be moved to a cage to be on their own after attacking one of my female mice. After they were moved they became pretty calm until I went to put a toy in their cage and I guess I scared them. They bolted around the cage and ran back under their house, then flipped over and began twitching and peeing alot. After they were calmed down I noticed a bump above their anus. They've have greasy-ish for lately that the others dont have. I've had it since one of my females had a litter and it was the only one of five to survive. I name it Juuzou because I thought it was a boy, but my boyfriend said its probably a female. Anyone have an idea on what could be happening to them?