Firstly I need to know what type of leukemia
you are having and what type of treatment you are receiving for it.
You are already under antibiotic and under antifungal cover.The abscess
of your foot needs to be drained. This can be a trigring factor for your low platelet count
. Your Primary physician will know if platelet count is so low that chances of post drainage
bleeding are there. There is no risk to be on antibiotcs till the infection is wiped out.