My guess is that it's time to start a 'relationship' with a good dermatologist?

Maybe they would take a biopsy of the 'flakes' and see what the source is...IF a source is to be found.

I do know I see my own Derm. yearly and get the bulk of the prescription salves and lotions or potions I need to keep me well 'ICK' free until my next yearly visit.

Worth a try at least? - good lluck - j