I was bitten by a tick on 6/18. The bite faded but now I have a pimple by it...?

I dont think its at the direct site but near it. its raised and hard underneath...almost like a boil. the tick wasnt on me long because I felt the bite. when I took the tick off me, it was still.moving & I disposed of it...maybe on me for 30 mins before I.felt it. should I worry?