Re: Flat Warts?
Welcome to the boards, ben83!
What you are describing sounds like plantars warts. They are flat because we put our feet in shoes and stand on them, and warts have the characteristic black specks in them which are actually blood supplies they develop to feed them.
Please keep in mind that not every doctor out there will be a good fit for you. Now that you have over 30 of them, you really need to be under a doctor's care to rid yourself of them or you risk having them spread even worse. They are very contagious, and you can get them in other parts of your body as well.
Primary care doctors as well as dermatologists can freeze warts. With so many of them, you probably need to be working with a dermatologist now. Try giving another doctor a chance, and if they aren't a good fit for you, go to another one yet.