My baby is 8 months old. She sometimes has red spots on body (face, hands, back, forehead etc), a small button sized area of red patch, some of which disappear soon after but on some, a small raised dot appears in the middle, then the spot area reduces leaving only the bump. With time, it gets dried and goes away. Happening since she was 3 months old. One or two a day, sometimes 4-5 in a nearby area. Then stopped for a few months. Happening again since last two weeks. For the last 3-4 days it's been too many a day. Last time I checked with the doctor, he said insect bite, but I'm pretty sure there is no insect. What is this and why is it happening, any solutions?