My 5 yo son had ADHD and is on Focalin XR for about 6 months now. For about the last two months my son is always chewing on his sleeves or front neck part of shirt. He is ruining his shirts and I can't get him to stop. When I tell him to stop he will, and say sorry but then again 10 minutes later he will be doing it again. I am wondering if this has something to do with his condition, I heard ticks can sometime develop with meds. Would this be considered a tick? My DH seems to think it is just a habit like thumsucking and once he started he could not stop, likes the taste or feeling or something. Anyone have a clue? Should I just ignore this or is this something I should be worried about?