if you do not have any direct contact with a person who just assumes (self-diagnosed) he has ringworm (a fungus called "tinea corporis not a worm of course) you do not have anything to worry about. transmitting this fungus requires a considerable amount of close contact which you do not have. since the is getting worse after using anti-fungal cream it would be in his best interest to be properly diagnosed. there are many round skin lesions that can mimic tinea corporis so his self-diagnosis may be wrong or he has not used the anti-fungal medication long enough.
i have a coworker who thinks he may have ringworm. he's been using antifungal cream for a week. is he still contagious? . additionally while he's been using what he claims is an antifungal cream he said it has seemed to get worse. could it be something else or is it just a more stubborn case of ringworm? i'm asking these questions because while i don't have any close contact with this person we do touch some of the same office equipment/items. i have disinfected my desk with lysol wipes and have been washing my hands. i am wondering for how long i need to be more cautious (i'm kind of a germophobe as it is).