A week or so ago i noticed a large red, raised mosquito bit looking bump (little smaller than a dime). It was itchy for days, then more started to appear, then some on my husband. They are not in clusters or in rows, or where tight fiting clothes are, they are random. We both feel itchy all over and have not seen ANY bugs, spiders, fleas..nothing to show that there is something in our house. Please help, im not sure what direction to take to get rid of these invisible bugs!!