This is going to be a long story and I hope there is someone in this group who can offer advice.
What treatment is used for skin problems? I have a sarcoidosis diagnosis (biopsy of lymph node in my 30s, now late 70s). Always had some kind of relatively minor skin problems most of my life. No one ever suggested they were autoimmune related. In 2015 I started low dose longterm prednisone treatment for polymyalgia (PMR) and in the ensuing 9 years forgot about my skin problems! Upon remission in early 2024 I was able to discontinue pred, which I'd been taking at about 2 mg more or less for several years. A few months later started to get rough, reddish patches of skin. Eventually remembered my skin history, related it to the probability that low dose pred had kept this in check for so long, and am now trying to find a way to deal with these, so far, minor skin lesions.
My GP prescribed betamethasone valerate as otc hydrocortisone ointment wasn't really doing it. I didn't find it much better, as soon as I taper off it the patches come back, and I'm rather afraid of it as told not to use much and not for a long time. The doctor was kind, though and at my suggestion gave me a rather limited prescription for prednisone.
I took 5 mg then tapered at his suggestion fairly quickly, I went .5 mg about every 8 days. As soon as I got to 3.5 the improvement in the skin stopped. At 3 mg there were new lesions. I had just enough pred to experiment, because I'd really like to get back to taking 2 mg pred and having that work. Taking 4 mg pred stops new lesions. I still need a bit of otc hydrocortisone on remnants of the existing ones but they are going.
What I hope is that by continuing the prednisone long enough I should be able to slowly return to 2 mg, where I really had no side effects, and find the skin problems once again recede out of sight and mind. At my age and with my positive experience using pred for another condition I'm personally not worried about taking it for the rest of my life, and to my mind beats chasing constantly recurring skin patches with other equally (if not more) problematic medications.