 [ Symptoms ] what causes atopic dermatitis [ Disease ] 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