Sentinel Node Biopsy - reaction?

I had this procedure done Dec. 4, along with Breast Needle Locate lumpectomy. Pain is manageable, however I have turned blue/black colour beyond center of other breast and almost to colar bone above both breasts.  Also blue/black colour has now spread from naval to just around side/back and down through groin area. That area is also swollen but no soreness.  I was given no warning of this.  Can anyone comment if same has happened, or might I be having an allergic reaction?  I will check at Hospital tomorrow - just wondering if I should be worried. Thank you for your help.