My ds2 had ringworm at 5m. It looks like round or oval red shapes, more red at the edges and gets into the damp places - nappy area, back of knees, groin etc.
Unfortunately by the time it was diagnosed it had spread all down the back of his legs, tummy, back, bum etc. The bloody health visitor at first said it was a sweat rash and to put nappy cream on it which made it worse as ringworm likes damp! We used cream called Clotrimazole which was on prescription. Its the same as Canesten.
Now here is the bad news. IT TAKES AGES TO GET RID OF IT.
Because it was in the nappy area and that area is usually damp - damp if using cloth nappies and damp from sweat etc if using non-breathable disposables, it actually took THREE AND A HALF MONTHS for it to finally clear.
Even the parts up his back and back of legs which were not in nappies took about a month to clear.
We kept seeing an improvement then it would come back. We kept on putting the cream on 3 times a day and giving as much nappy free time as poss and gradually gradually it went. Whenever we went out and he went more than about 3 hours without some nappy free time it went worse again.
The clotrimazole instructions say that it needs to be applied for ages before any improvement can be seen as ringworm is very stubborn.
How long have you been applying the cream? It might be working but just very gradually.