How To Treat Cysts At Bottom Of Foot?

Hi, may I answer your health queries right now ? Please type your query here...i have these things comming on the bottoms of my feet i had one removed years ago and the dr said it was a cycts but now i have one on one foot and 2 on the outher foot they have a hard center i can pick out and they are very pain full to walk i dont have any inc and cant afford to go to the dr what should i do could it be cancer or something