HI Kate, When you say discoloration do you mean like little brown dots, like pigmentations? I was on the FOLFOX (5FU and oxaliplatin) and a trial which was either avastin or a trial drug called AZD that works the same as avastin and I got little brown dots on my hands. I was only on it for 5 months for bowel cancer. I finished at the end of April and they have now all cleared up. Hope that helps. Cheers Mihalo