When I walk outside onto the patio during the warm weather months, I can usually look down and see these yellowish bugs on my arms and on my clothes. They are tiny. One landed on my paper, and it was about the size of a period. And, I think they bite. What are they? Chiggers? I tried doing an image search on chiggers, but everything came up blown up like in a microscope. If they're chiggers or something else, is there something that could be put down on the grass to get rid of them?