Paul,
As Kev wrote, if it's already visible on your skin (there are useful pics on the web to compare to), then an antibiotic cure is practically unavoidable. Preferably, stronger than penicilin (for example tetracyclin/doxycyclin), because the bacteria is becoming increasingly resistant.
Residual disease (small pockets of bacteria having survived this cure here and there in the body) is argued upon. The American Lyme disease association of doctors says it's real (as do many Antroposofic doctors), others say it's not.
In Finland, they sell a rather mild homeopatic cure, Borrelia C30, as a followup after the atibiotics. Circlum Farmasia Oy, info@circlumfarmasia.fi .
As a prevention, most pharmacies also offer insect repellants that have been custom-tailored recently to stink bad to a tick. You spray it onto shoes, socks, pants bottom etc.