Has it gone back in now? My degu does that every now and then but it isn't stuck out. He squeals and makes strange noises while "biting" himself (although he doesn't hurt himself) and it's out for quite a time. I'm guessing it really was stuck out if he let you touch it to put cream on it. Was it bleeding? I hope someone around here can help you because I have no idea. If it were my pet, I would probably keep an eye on him to be sure he was urinating and functioning properly. If he looks really sore, I'd take him in. But that's just my opinion, having no experience in that particular situation. Hope he feels better!