Each sting will turn into an itchy blister over the next day.
The fire ants' bite contains venom. This can cause the area to swell up quite a bit. You treat the bite the same way you treat a bee sting. Wash the area with soap and water. Rub the sting with a cotton ball soaked in meat tenderizer and water. You can also hold an ice cube against it. Some people have an allergic reaction to fire ants. The symptoms are just like the ones from a bee sting. If you have any of these symptoms, see a doctor as soon as possible.
The best way to avoid getting bitten is to avoid fire ants and their mounds. If you're near a mound, keep your shoes on. And don't ever poke at it or try to play with it.