The trouble with being a flaker is that everyone seems to be slightly different, and after generating lots of dust for over 30 years, it also changes through your life.
No fabric seem to upset my skin, but very occasionally a detergeant will. Sometimes diet, stress and sunshine affect me sometimes they don't. It is a pig to pin down.
The last time a read up on reseach they would seem to be blaming (at least) three different gene defects, so in a few years it may be diagnosed as three+ different types, with auto-immune issues also thrown in the mix.
The best advice is to be ready to change tactics – some summers sun and sea water clear mine up, some years they make it worse.
Not much help I'm afraid. But this site always cheers me up.