Something kind of freaky happens to my husband in the summer - we think it might be bees - or some other type of insect with a mild poison??? He doesn't really get stung, but he runs into something that leaves a welt with what I can only describe as a drip mark running down from it - as if you threw a water ballon at a wall - a splat, then the liquid runs down. He gets them on his front, usually on his chest or upper arms. Most of the time it takes a couple days for the red mark to go away. We've never seen the remains of what ever insect causes it, so we're not sure if its bees or something else though.