My excema on my back won't go away after a couple years?

Possible eczema. I would agree with dr. Irizarry. I would add however that any eczematous problem that does not improve with appropriate treatment should have further evaluation by a dermatologist as a biopsy may be necessary. It is possible that the diagnosis may not be correct or the treatment may not be right on the mark.
Eczema. We need to know exactly what have you tried, for how long, and look at you skin, and review your medical history.