Localised infection may be caused by many things, just like when you cut yourself, any breach of the skin is an easy route for infection to get in; it may not necessarily be Lymes.
My GP recommends I remove any ticks ASAP (last one actually extracted itself anyway as I was getting ready to do it), keep them safely and watch out for symptoms. If any symptoms present then make an immediate appointment for him to prescribe treatment & to bring the tick with me for him to submit for testing.
One old guy I used to shoot with, an ex terrier & rat / mole man had both Lyme and Weils disease throughout his lie untreated & used to have to take enzyme tablets with every meal just to digest his food. These aren't diseases to take lightly.
Ticks are nasty little suckers and make me feel good that all those sheep I threw into the vicious old "burn your skin if it got splashed on you" sheep dip may have not liked it but I killed a good few ticks in my time!
If you've read the links and are concerned/showing any symptoms then get yourself checked out ASAP, and take the links to the LDA site and BADA with you, my GP came from a small rural practice & was very familiar with the disease, a city GP may not be so clued up.
With the wetter weather in the UK & lack of temperature extremes their spread will only continue, the thing that most worries me is missing an adult female, having it drop off in the car or house & it laying it's thousands of eggs.
Good luck!