Hello and thank you for your question,
It is hard to make a skin rash diagnosis without seeing a picture but from what you are describing it sounds that you have a condition called Granuloma Annulare which is basically a chronic skin condition consisting of a reddish rash in a circle. Usually the center is lighter in color and there is a darker "ring" surrounding the lighter area. Usually there is scaling present with this condition.
Because this rash doesn't cause any symptoms (itching, pain, etc), no treatment for it is necessary and eventually the patches go away on their own.
If you do have scaling, it is possible that you have a fungal infection for which creams can be prescribed.
It is best that you see a dermatologist for a full evaluation as again, I cannot feel or see the rash, but based on your description believe that that is what you have.
Please feel free to follow-up with any other questions you might have.
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Best wishes and good luck,