Hello and welcome to Healthcare Magic. Thanks for your query.
From the description of his symptoms of whitish, cheesy discharge under the foreskin with itching, it is likely that he is having a candidal balano-posthitis
(i.e. male thrush
of the genitals). The lymph
node enlargement is likely to be due to the infection, rather than due to the antibiotics.
In candidal genital infections, it is important that both partners get treated, since there is a chance of cross infection. So, I would advise you also to get treated.
Wish you all the best.
Dr. Sheeba Stephen
Emergency Medicine Specialist