i was doing my boys weekly checkup, and i noticed one of them had a tiny little yellow-ish white bump where his whiskers are. its solid, but i couldnt hold him still long enough to check it out further. hes definitely my wiggliest rat lol. hes a 3 month old double rex. i had to treat the mischief for fleas a few weeks ago, could it be related to that? it is VERY small. i doubt id notice it if he wasnt bald