My question to them , why do my feet go blue or purple. None gave me an answer. Then on my YouTube Dr Arron Boston , said he sees it often with his patients, its due to weak calf muscles not Pumping the blood back. I don't generally follow Dr Arron Bosten , don't like his introduction music , its too long , but this time after skipping music, thanks. You would have thought they could have told me, instead of me doing my own research.