I get it every now and then I do Jujitsu and I often see lads not showering after training and it really pisses me off and they don't see what I get so annoyed about. There is a stigma with ringworm but it's not caused by poor hygine, though poor hygine does increase your chance of getting it and it deffinatly increases its spread.
First time I got it cream like lamisil did the trick, second time I needed pills from the doc, third time too, fourth time I had to go back to the docters for more pills AND an upped dose ... It stayed for about 5 months. It started going after I applied diluted bleach to the lesions ...I'm not saying you should do this, and a docter will almost certainly tell you not to.
Change your bed sheets every night, use your towels only once then wash them. Also try a combination of lamisil and mycota creams, the fungi that causes ringworm is the same that casuses atheletes foot, so if you have that mycota powder your feet too.
If you are using communal showers don't share soap and wear flip flops (should be wearing flip flops anyway but a lot of people don't) Ringworm is highly contaigious, do not share clothes, towels or a bed(sorry) with anyone or you will pass it on to them.
Remeber it thrives on warmth and moisture, so don't apply moisturisor to the area and keep any effected areas uncovered when you sleep.