What is this on my feet and how do i get rid of it?

I used have these blisters on my feet and now there gone but on my heels and the back of my ankle it's left this lose skin in a circular shape, I don't know if all of them are from blisters. But if I peel it away it takes away a few layers of my skin.
What is this on my feet and how do i get rid of it?

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).