What can i use for calluses and corns if i don't have a doctor?

Stone , padding: Use stone or ped egg to thin area, pad area with felt strips and wear shoes which do not put pressure on areas.

Prevent rubbing: Callouses and corns are the body's way of responding to friction and rubbing. They are common on the feet, when one toe rubs against another toe, or against a tight shoe. So, the first thing is to cover and protect the areas that are being rubbed with a piece of cotton or a bandaid, and then use a cream with urea and/or Hydrocortisone to soften the corn. It will take months to get better.