Good news! Holly, if it was a dangerous insect bite normally you wouldn't see a whitehead, it would look more like 2 punctures close together and there would be a lot of redness and swelling. More likely, it's exactly what it looks like: a little whitehead pimple =) Sometimes they also get little sebaceous gland infections or very minor cysts that eventually go away as well. Glad to hear this one is subsiding.