C.S.
Maybe he picks because his nose is dry, so he needs it hydrated (Ayr jell). Talk to him about it and explain the nose bleeds come from his fingers giving him oueys in his nose. Try clipping his fingernails back and clip off or file the edges so there are not rough edges. His nose could be dirty beyond the nasal cavity you could visibly see. At two, blowing probably isn't option, but try to keep it clean. The scabbing from a previous nose bleed could be irritating him, so he picks at it. So here it goes again, keep the jell on it so it will stay moist. Habits are hard to break and take constant reminders not to do it and then it is still difficult.