While chemotherapy drugs do cause some form of lowering of the activity of one's immune system that may predispose to infection (or abscesses), it is rather very hard to conclude just by appearance if these two spots in your liver is indeed an abscess. Abscesses of the liver would present with right upper quadrant pain, fever and elevated temperature with chills, and an overall 'ill' feeling. If you don't have any of these symptoms then it may be unlikely that this is an abscess.
These spots can just be benign cysts that were missed on the earlier scans, or new cysts wich really has no clinical significance. More importantly, any new spots in the liver should warrant investigation as if this were due to cancer spread until this can be proven otherwise (possibly through a PET scan or biopsy).