i have had these sun spots so to speak for a while now. my doctor gave me a cream and oral medicaine to take. it went away for a while came back again, went back to doctor, went away again now it's back and even worse. when i am in the sun it sewlls up and itches. now some of them are turning a grayish color. these cover my entire back , my kneck,arms and chest. anyone have any idea what this is and if the sun is making it worse. i haven't been to the doctor since the last occurance.