I can understand your concerns, I believe that your history suggests some sort of infestation in the family like scabies
and its just a coincidence that you are relating the problem to corn
Scabies is contagious and can spread very easily to the close contacts,so i would suggest a visit to a dermatologist
so that he can have a general physical examination and starts a proper treatment rather than waiting for it to go by its own.
I hope you would understand my point.
all the best.