First of all, please consider avoiding doctors who take biopsies of penile folliculitis on the grounds that, "at the stage it was in it was doubtful it would have healed."
Sex produces sweat, which can "clog pores" and lead to folliculitis, which is what it sounds like you're describing. This is best left alone. A topical antibiotic cream like bacitracin or neosporin, no doubt available anywhere, may help speed the process, but benign neglect is best. Careful inspection of the "penis for color and geographical landmarks" seems excessive, and the manipualtion involved may delay healing.
Best.
Dr. Rockoff