Eczema, psoriasis, thyroiditis, joint pain, gut symptoms — the treatment is usually something that suppresses the flare. It works while you use it. Stop, and it returns, because nothing about why your immune system is reacting has changed.
For many people the reason sits in the gut: a barrier that has become permeable, a microbiome that has drifted, and a set of foods quietly keeping the whole thing lit. You cannot guess which foods — that's the point of a structured elimination and reintroduction rather than a list off the internet. Find them, repair the barrier, then build a diet around what your body actually tolerates.