It does sound like a hemorrhoid. However, I wouldn’t put any cream or anything on it until you are 100% certain that is what it is. In the future make sure you are using a lots of lube, even if the condom is pre-lubed. Lube is your best friend when it comes to anal. There are all types of lubes now and I would avoid anything that has any sort of dyes or fragrances and something specifically safe for sensitive skin given the area. I would definitely get it checked out sooner rather than later because I know they are very painful when dealing with. Good luck!