They appear to be insect bites, but in a small circle? It's the size of an apricot (more or less) but almost completely flat. I felt small 'pinches' when it happened, then ferocious itching, then soon after it turned to pain and intense sense of tightness in the muscles near the injury and a general feeling of malaise. At first the area was extremely red but it never expanded in any direction. No discoloration, no eruptions per se, no noticeable pus, nothing outside of the circle itself. I applied ice, but this made the tightness worse. I wonder if an ant got trapped under my shirt? Or perhaps this not an insect bite at all? Shingles? But so small? Now after several days I have a lot of burning all over the area (but diminished redness, no swelling) it is itching again, the tightness is bad.