I had a surgical breast biopsy 2 weeks ago. The finding was LCIS. I have had no problems with the surgeery until last night when I started having some pain in the arm on the side of the surgery. I also found a large mass under the surgical site. During the night I developed a throbbing pain in my breast. The mass in my breast is very hard. If any one has had this happen or know what it might me I would like to hear from you. Thanks, Laura