In the sport of wrestling ringworm is a big problem so I'ma bit of an expert, but there are simple solutions to get rid of it easily! Ringworm is a fungus, but most fungal creams are not strong enough to actually eradicate it, so something like Lamosil is a great option and its what most wrestlers use. You can easily get this over the counter in america but in places like canada you will need a prescription (easily obtained via walk in clinic). Ringworm is nothing life threatening so if you ever see it dont panic. Also things like cortisol and eczema creams supress the immune system and stops it from fighting the fungi, so don't use these!
I had a friend catch ringworm after spending the night at one of our friend’s houses that was not very clean. Never washed the sheets never cleaned the floor type. She couldn’t get rid of it for at least a year