The only asymmetry I've noticed is the ears, I tend to look at ears though as it was something I was conscious about (and had an otoplasty). The funny thing is since I started analysing people's ears I can clearly see that many many people have different ears, whether it be size, shape or one slightly protruding more than another.
But not many people have a perfect symmetry in their faces. Infact if you look closely at anyone, even celebs who are deemed as good looking by a large amount of people you can spot asymmetry.
What is it that you're concerned about?