Hi. Your post made me think that perhaps you are experiencing the same thing I am... "Extremely itchy", red, pimple like bites on the legs that last about a week. So far, my research seems to indicate that I'm probably dealing with chiggers. The bites I'm receiving are seasonal and happen in the fall, when I venture into the backyard or the surrounding woods. Chiggers are too small to easily see with the naked eye and by the time the bites swell up the chiggers are usually gone. However, the post, describing the bites to the face and hand has me thinking bed bugs, but I'm no expert. Although chiggers can hitch a ride on you into your home, they don't usually infest your home like fleas or bed bugs. Wrong environment for them. Chiggers also have trouble holding onto you so they like to bite were clothing or skin folds will keep them in place, hence bites on the legs, back of the knees, and groin if you are wearing pants. I hope you find a solution to your bites. Do you have any outdoor activities that take you near moist areas with underbrush, tail grass, weeds, etc., were you might pick up chiggers? May I suggest looking up info on chiggers and bed bugs using your favorite search engine?