from the description provided, its hard to think of a particular diagnosis. Only a clinical examination may help in diagnosin your skin concern. However it couldbe ring worm
, granuloma annulare
, erythema annulare centrifugum, annular psoriasis
etc. As you can see there could be many skin diseases presenting with similar lesions, so a dermatologist's visit is mandatory.
Please meet your dermatologist for an expert opinion.
Hope this helped.