I use Ivory sensitive skin soap to shower with and we wash our clothes with Persil sensitive skin detergant as it seems to work better than other makers products. My back still itched and I mentioned it at my last dermatology check-up. The Dr. said I can prescribe something that will stop that and it's dirt cheap. It's triamcinolone acetonide cream-0.1% and it is certainly cheap. A 454 gram tub which is larger than most over the counter products was 5 bucks with my drug plan and it blows the OTC stuff away in effectiveness. You might discuss this during your next doctor's visit. You use it like other cortisone based skin medication, five days on and two off. It works so well I only put it, well, my wife puts it on for me, once a day instead of twice daily.