This may not work,but in my experience most Bethesda games can have this glitch. The one i usually experience is when your characters face becomes permanently stuck with the combat snarl..looks very silly =) Same thing used to happen all the time in Fallout 3..my characters mouth would become permanently open after a fight or after sitting down on a chair..making him look like a drooling idiot.
Anyways,i found that the best way to deal with the problem is to make sure that you always keep a save-game from there very beginning of the game..like,the literal second you gain control of your character at helgen keep. Now,if you reload that save..then load up your current save again,the problem should be fixed. Works all the time for me =) As it did in Fallout 3 and also in New Vegas. My experiences with it in Fallout 3/NV are the very reason that i still have save number 1 sitting there in Skyrim,just in case.
Oblivion didnt have this problem...However,it did have another strange problem where my characters face had a tendency to change slightly every now and then...and,the same solution i just described always fixed it. Just make sure you always keep that save from the very beginning of the game.