i hav extreme dry feet problem with itching , it will be through out the year in all the seasons, when i scratch or scrape with a foot pile or blade , a powdery kind thing comes from the skin surface, i had visited several dermatologists each one diagnoised in different way and gave different opinion like one said it is eczema and the other psoriasis, confused should i go to another dermatologist or should i visit podiatrist, please , i need your advice