I've had dry, scabby from scratching , itchy back of the knees for a year now, i don't know what it could be and the skin is red and darkened & bumpy?

TryThisForTwoWeeks: After a year of dryness and scratching I can assume it's a mess back there.That's a common place for eczema-like rashes and there are a few ways to beat it.At this point you should consider a dermatologist to sort it out. But if you're short of time and cash start by using a moisturizing cream that contains lanolin and a mild topical steroid like 1% Hydrocortisone cream. Use each three times a day