The site where I was bitten swelled up, itched horrible and was very tender to the touch which made the itching that much worse. It had a knot under it that grew to almost golf ball size.. After about two and a half weeks, it finally healed.. About a month later, the same site started itching and swelled up again some, It took a lot of self control to keep from itching and it went away in about a week. Well, it's back again!!! Help! Why does it keep coming back? I have no other symptoms other than the uncomfortable itch and if I scratch, I know it will swell up again, I can already feel the knot forming under the skin. ???