How To Treat Bruise Across Upper Back & Width Of The Shoulders?

I have recently discovered that I have bruising across my upper back,across the width of my shoulders I have had no accidents, there is a niggling pain/aching,picking feeling where the bruising is it looks like big finger print markings should I go see my G.P.? From left to right it looks like nail marks,then bruises, a lot of redness and is like an s shape, It has been there now for some weeks they don t disappear, I would send you a picture to give you a better look at it but that option is not here please advise if you can. Thanks Gloria