They tried to bill me for that in the past at practices I was a patient of. There's a fine line between preventative care and E/M. You can generally walk the "preventative care" line by presenting your concerns as an observed change to be documented rather than a problem to be solved.

If they do charge you, call the office to appeal the billing and they generally drop it as long as you can push the point that you weren't seeking a specific treatment but rather were just informing the doctor of a change in your health or conditions since the last visit.