Non itchy skin color raised patch no scale over both elbows & knees, all of same duration treated with mild steroid no response. probable diagnosis?

Difficult to know: A chronic rash is difficult to diagnose without more information about you and visualization of the rash. A Virtual consult may help. With the information given, granuloma annulare comes to mind. Usually there is a central depression within a ring sized flesh colored patch. If stretched, you will likely see smaller papules. They sometimes herald thyroid disease. Low potency steroids fail.