Itchy Legs

I don't know why my legs have small bumps and they are so itchy. I took a couple of warm showers and put some itch calming lotion but it doesn't seem to work. Arggh! Just the other day we waited for my daughter's friend outside for their playdate. We took goofy pictures and while waiting I sat on the grass. So now I'm wondering if the grass caused the itch or some fire ants. If it's fire ants I could have noticed. I wonder if it's because of the changing weather. This is really bothering me and I can't sleep.