For about the past six years, starting in November or December, as the weather gets colder in Florida, I get these small scabs on my thighs and butt. I also itch a lot, it is to the point that I will wake up in the morning and see the bruises on my legs. Or I notice an itch and then I realize I am covered in scabs. They appear out of no where and then just go away again in a couple months. What is this?