Any patch of skin that is subjected to friction or pressure on a regular basis might become hardened and thick. This is a protective mechanism used by the skin to protect itself from irritation or friction. A callus is a thickened region of skin that has hardened.
Calluses are a regular occurrence. Most of us, in fact, have them. These are frequently found on the soles of the feet, which are regularly subjected to friction and mechanical forces. The balls of your feet bear a significant amount of your weight. Chances are you’ll detect a callus or two if you examine the region attentively. If you play the guitar, your fingertips are nearly guaranteed to have hardened patches of flesh. Building up these calluses is, in fact, an anticipated part of learning the instrument.
These patches have no feeling since they are made up of dead skin cells. If they get huge and thick, though, you may feel them on the bottoms of your feet as you walk. This sensation might be unpleasant and make it difficult to walk normally.