How to stop it?

Ok so I have calluse on my finger and hand but not the one I write with.. how.did I get it and how can I get rid of.it.. it has started to hurt.. what will a Dr do.if I go?? Will I have to have surgery?? Help!!!

http://www.beastskills.com/removing-calluses/
this will help !
its steps on how to remove calluses.
its really good apparently read the comments below the page.