Lump found same breast at surgical site with redness

I just found the lump tonight at the same place the last lump was excised (June 2000). The scar is very red and hot to touch. Do I wait to see what happens or call my surgeon tomorrow and ask for a mammogram, biopsy or sonogram? I've cried for the last hour because of this. I want to be aggressive in finding out what it is, and sometimes the doctors want to wait and see. Anyone else have this happen? Thanks, Paula P.