If you have been bitten by a tick (a small arachnid), remove it as soon as possible to reduce the risk of getting a tick-borne infection, such as Lyme disease (a bacterial infection that causes a rash).
To remove the tick:
Use tweezers, wear gloves or cover your fingers with tissue to avoid touching the tick.
Grab the tick as close to the skin as you can, and gently pull straight up until all parts are removed.
Do not twist or jerk the tick as you are removing it because this may cause the mouthparts to break off and remain in your skin once the tick has been removed.
Wash your hands with soap and water.
Using petroleum jelly, alcohol or a lit match to remove a tick does not work.
After the tick has been removed, clean the tick bite with soap and water or an antiseptic, such as an iodine scrub.
Do not scratch the bite because this will cause further swelling and increase the chance of infection. Most tick bites will heal within three weeks. See your GP if you develop:
a rash
a temperature of 38C (100.4F) or over (fever)
You may need antibiotics to prevent Lyme disease.
From here.
http://www.nhs.uk/Conditions/Bites-insect/Pages/Treatment.aspx
Tick on skin and tick sucking blood
Strictly speaking, these small spider-like creatures aren’t insects, but ticks are increasingly becoming an unpleasant feature of strolls through UK woods, moors or thick grass. Once they’ve latched onto you, ticks cling to your skin and suck your blood. The bite doesn’t really hurt, but certain types of tick can transmit a condition called Lyme disease. Therefore, remove a tick as soon as you spot one on your skin.
Prevent tick bites: Wear long sleeves and trousers when you’re walking in forested, overgrown areas and use a tick repellent.
See a doctor if: you get a circular rash spreading out from where you were bitten or you develop the symptoms of Lyme disease.
Send any ticks you collect to the Health Protection Agency and they’ll identify them for you. Find out more about the HPA’s Tick Recording Scheme.
http://www.nhs.uk/Livewell/bites-and-stings/Pages/insects-bugs-that-bite-sting.aspx