One of the biggest things I hate about Texas is fire ants. They are evil and the bites are painful. My daughter was bit on her arm yesterday while sitting in the grass, even though there wasn't a visible nest nearby. Untreated, the bites look like this photo. I have found you can prevent the pimple like appearance if you pour straight bleach on the bites immediately and then rinse the bleach off ( bleach isn't harmful unless it gets into soft tissue). That obviously didn't happen yesterday.
If you are lucky enough to live somewhere where you can enjoy things like being outside and sitting in the grass, be thankful! Fire ants are just awful and totally impossible to get rid of.