I have what I think is contact dermatitis from my jewelry, The weird thing is, I got this a few times, it will last a year & go & be fine & come back?

Nickle dermatitis. Most commonly this is from nickle. See if certain items cause the rash and others don't. Nickle is an ingredient in a lot of metal mixtures - it is mixed in. You need pure platinum - even gold and silver are most often mixtures.
Contact dermatitis. By definition it is due to contact with offending agent. If you figured it out, then you need to AVOID what is causing the rash. If the rash is occuring despite you avoiding the agent you thought it was, then it must be something else, or possibly there are other things you are allergic to.