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Bleomycin is the big boy of cancer treatment. I've never heard of chlorambucil and its not in FA.
I had never heard of chlorambucil either and after researching it found out that it's also an alkylating agent, specifically a nitrogen mustard - same as busulfan, so you weren't wrong! Based on what FA says re: bleomycin & busulfan (extrapolating this to chlorambucil), they both cause pulmonary fibrosis & skin hyperpigmentation, however, in the Lange Pharmacology flashcards it says that the hyperpigmentation with busulfan is from adrenal insufficiency so I guess you would expect to see symptoms of that as well if the same applies to chlorambucil?
jk ignore my previous comment. just checked uptodate and it doesn't list hyperpigmentation as a side effect of chlorambucil.