My son and I fished Wet Beaver Creek on 4/16, about a mile above the road that crosses the creek at the day use area. It's a pretty slow moving stream with lots of pools and very clear water. Lots of really small bass and some stocked trout. Anyway, when we got home I had tiny red spots all over my legs below the knee. My son had a few, but only above where his socks covered his legs. I thought they were just scratches & punctures from the raspberry and/or blackberry bushes we had to occasionally walk through, as that is what it looked like and my legs have looked like that many times from stream fishing without waders when there were brambles I had to walk through. But last Thursday, six days after the fishing trip, those red spots grew to large red bumps that itch like crazy. Imagine about 50 fresh mosquito bites on both legs, all itching at once. I thought maybe we had gotten into poison oak or ivy, but the onset time was way too long and after looking at pictures of those plants on the internet I confirmed that we weren't exposed to them. Then I discovered some pictures of something called swimmer's itch, and bingo, I was sure that's what we have. My doctor thinks so too. On your first exposure to it, it takes about a week for your body to react. The next exposure, it's only supposed to take a couple of hours for the reaction. Anyway, swimmer's itch is caused by a microscopic parasite in the water that comes from bird droppings. You can get it swimming in lakes, ponds, streams, etc. The little bugger burrows into your skin and dies. Apparently the natural host for reproduction is snails, so when they get into humans they just quickly die. But then eventually your body tries to rid itself of them and you get an allergic reaction to them. The spots eventually go away, and you don't have to take any medicine unless you need a topical steroid to reduce the inflammation. But it is super uncomfortable and really nasty to look at. Wet Beaver Creek is a really popular swimming destination, so I wonder how many other people are getting exposed to it right now. If you plan to fish there, you should wear waders. Don't wet wade it like we did. I've never encountered it on Tonto Creek where we fish quite a bit, but that creek has a pretty good flow to it while Wet Beaver is low and slow. Has anyone else ever encountered this on any AZ streams?