Cat Update

I just wanted to give you an update. A few readers have asked about Charlie. He seems to mostly be better. We took him to the vet last week and all his lab tests were normal, so there isn't anything seriously wrong with him as far as we can tell.
He is still licking his fur a bit too much. I'm not entirely sure the cause, but the vet thinks it's environment. Is it stress? Is he upset because I travel a lot or am away from my apartment for work and social things? I'm not sure.
At this point, I'll just wait and see. I don't think it's a serious skin condition because the anti-inflammatory hasn't helped. A few people have suggested fleas.
Any thoughts?