It's probably best not to talk about this at all. Just accept who've you told and ask him if he can just not tell anyone else. You can tell them you went on a short vacation or an educational seminar. Your husband is trying to prevent everyone knowing you had a facelift but knowing you lied is much worse and there is nothing wrong with a facelift.
I would just sit down and ask him if he could not talk about it or just tell people someone else. He may not realize what will happen once people realize that he lied.