Suggest Remedy For Pimples On Foot

Hi.I have this pimple thing on my foot. It is yellowish and kind of clear. They have heads like pimples and it hurts when I walk barefoot. I have three on each foot and they are all close to each other. I have had them for about 3 weeks and I don't know what to do with them. I tried to pop them but that put me in pain. What should I do to get rid of these? Also what are they called? Will they stay forever?