J.B.
My 9 year old son recently started showing some facial tics - he kept looking like he was winking at me, then would twitch his nose and make a little twitching motion with his mouth. It lasted about a week or two. By the time we saw his pediatrician later that same month for his annual check up, he had stopped the behavior but I brought it up anyway. His doctor said that it's probably a reaction to stress or anxiety and to just keep an eye on it. It was December so he was pretty keyed up about Christmas, school projects, hockey, and my husband and I were arguing a lot so I think he was just stressed. It was a good reminder to me to lower the stress levels in our household.
Anyway...it may be a passing thing or it may be a stress/anxiety response that comes and goes. Many kids display tics at some point or another and most grow out of it.