My fingers are very dry and are almost always flaking. My doctor thinks it's due to stress, but I can not relate to POIS.
There may not be a triggering agent such as candida but there may be something about contact like detergents, shampoos, etc.
In conditions of chronic stress, the skin becomes dry and allergies happen more easily. Just like in the mouth where we get less saliva and appear dental problems, bad breath, etc.