My son is 22, very active..pitches for college baseball, golfs, plays volleyball and is a waiter. Since he started pitching 2 months ago he has complained of intermittent right sided pectoral pain. Yesterday, the Dr. Found, after much palpating, a small lump in his chest/armpit area. She thinks this is a water cyst but is sending him for an ultrasound just to be safe. I am a nervous wreck...how concerned should I be? Thank-you