What Is The Pimple Like Huge Red Welt Between The Belly And Legs?

over the past several days I have been getting these spots on my belly & legs. It started out like a pimple with puss in the middle and has turned into a huge red welt. I thought the 1st one just got infected, I ve been washing it out with soap & water really good and putting neosporin on it. Now I have about 10 of them between my belly & legs. They seem to be getting bigger, they itch but hurt when scratched and looks like a huge welt. They seem to be like a huge whitehead at first. Do you have any idea what is going on? I am a little freaked out right now.