Hello for some reason as a child I would bite the skin under my big toe towards the outer part and this went on for many years and the skin slowly got harder and harder as it healed I would bite it many times till it bled and sort of just pull and peel it down as far as it would go.

I stopped a long time ago but now the skin that is there is extremely hard, has no feeling and is a lot thicker similar to a callus but when the dead skin is removed it simply regenerates like this has now become my real skin.

My question is is there any kind of special method to restore this kind of condition caused by years of biting at the skin and is resistant to the usual ways of removing a callus.