What Causes Itching And Burning Ringworm Like Rash Near Spine?

I have a rash about the size of a quarter near my spine- I have tried fungus relief 2% gentian violet hydrogen peroxide household bleach a potato slice selsum blue shampoo with selenium my husband smokes and touches my back with his fingers Which is the only known source of this infection that I can think of. This has the appearance of ringworm or tobacco rash with a sore about a dime size in the middle of the rash that has been iching and burning for about a year..