I was sitting on my porch last weekend. After a short time, I began to feel something crawling on me. I looked at my arms and legs and there were many tiny (smaller than the size of a pencil dot) black bugs on me. They don't bite, don't appear to have wings. It's hard to see them even with a magnifying glass. I just noticed a few on the cushions on the porch furniture, and I'm afraid to go out there again. Does anyone have an idea what they are and if so, how to get rid of them!