What could cause intermittent finger swelling (usually every evening and morning) and lip swelling (1 or 2 times a month). The doctor is thinking Reflex Sympathetic Dystrophy, but when I look that up it just doesn't sound like what is happening. Subject is 15 years old and otherwise healthy...no other symptoms. Any ideas would be helpful. Have been referred to a neurologist, but have not been yet. Thank you.