It may be a good idea to take a look at the Drematology forum as they may have some ideas about your dry scalp, that may be the way to start, to find out and fix that problem, I would think the picking is a habit and hard not to do if something itches and irritates, I know its easy to say but habits like this are a something like 'Mind over matter' when you want to do it, dont do it,, distract your self, go do something else,give yourself a reward each time you dont scratch or pick. Good Luck check out the other forum for help making your scalp healthier .