Yvonne's right. We'd need a lot more info to be able to give you any insight.
The first step is to figure out what caused the problem and fix that.
The next thing would be to tweak some husbandry parameters to try and give your leopard the best chance of recovery.
Finally, if you can find a good tortoise vet near you, take your tortoise in and start working with them right away.
Hope its nothing serious but from what I hear out of a lot of exotic vets that seem not to know as much as they would have you to believe, "let's give'm some baytril!".. I wish there were more tort expert vets around, at least in my part of the country. I hated give'n Cooper them shots, everytime it almost had me in tears, and yes I AM A MAN! I just hated grab'n his leg and doing it knowing I was hurting him, all be it for a good reason, even tho the reason was my fault due to my ignorance of not reading enough about tort husbandry. Even to this day he hates his legs being bumped or anything, and before it didn't bother him. Sorry, I just go on and on. I just hated it sooo. Good luck with your tort, I pray its nothing serious!! What substrate are u using? Have a great day!