I may also have these itch mites. We moved into our current home last fall, and this year, since about April, I have some bites on my legs that make a pustule. That's common with our fire ants, but I usually feel a fire ant sting, and I don't know when this strange varmint bites me. I have been thinking it was chiggers on steroids, but it may be itch mites. The bite seems to take more time to heal that does a chigger bite.
lazy
I usually get more that one fire ant bite, and they are very aggressive. These bites are just scattered about my legs and lower torso.