White hard spots on the bottom of my feet?

that DOES sounds like plantars warts. They come back, and are caused by a virus which can stay in your shoe for quite a while. I used to have problems with them a fair amount. It sounds like your doctor didn't get all of it, which is why it would spread out and come back with more... they have a sort of "root system" for lack of a better explanation. If this is the case, it will hurt when you step or press on it, and that will be about it. I'd go back to your doctor, and ask him if he thinks it could still be plantar warts, and tips on preventing re-occurrence and spread of the virus. For me, I put any of my shoes that i could through the washing machine including sneakers, hand washed what i couldn't with just a touch of bleach or non-chlorine bleach, changed my socks often when I had to wear them and wore flip-flops most often to let my skin breathe, put them on right out of the tub so i didn't step on the floor, and cleaned the shower with a bleach cleaner when i got out. I also washed those flip flops once a week or so. I kept this up for i think a month or two, after i had all my warts removed and i havn't had a problem since.

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Yea wat tommy said or mayb its a boil so try hot compresses to see if it pops to me it dounds like a boil & its not gonna stop hurtin until the infection(fluid) inside it is out