"pimple" like bumps..anyone ever have them?

DX April 2008 stae 3b. Surgery + 6 months chemo 5FU. April 2009 1 yr colonoscopy. 1 tiny polyp that they blasted but thousands of little bumps that look like "pimples". BX came back negative. August 2009 "bumps" are still there, again BX is negative. Surgeon has never seen this before. Finally in November 2009 they lasered them all. December 2009, still gone. Now March 2010, they are back. Going again in May to have them lasered....again. They are not polybs, just "bumps". Has anyone had this? I am hoping this isn't going to be a routine thing!