question: I had a diagnostic mammogram and underarm ultrasound for a noticable thickening under my right arm yesterday. Diagnosing doctor said it was just fatty tissue and no swollen lymph nodes and nothing on mammogram. Swelling as I call it started in April. Saw OB/GYN for yearly in May, she noticed it as well and wrote the scrip for ultrasound and mammo if symptom persisted. Now have pain under arm in that area, spread to both arms, upper back and other armpit. Also general feel like I m coming down with something in the past week or two. No idea where to go next.