help! found a tick on my dog

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i was petting my dog last night, and i felt something strange in her coat. at first glance, it appeared to be a hair knot, but as i inspected further, i discovered it was a tick! burrowing in head first. OMG!!! i use frontline...and had just put it on her about 10 days ago! OMG!!! it looked like this:


so after i got it off and killed it (and i will say, it was easy to get off, so maybe the frontline worked some), i noticed my dog has a blood spot where the tick was and a slight bump there. i have never noticed a tick on her before (and i've had her for over 7 years). i am worried about lyme disease or some other infection she may get. please help this worried doggymomma out! =/