What to do for tick under skin of human?

If the tick has parts of its body burrowed under the skin, the best way to remove it would be to carefully hold a lit match up to the site of the tick. Most likely it will remove itself, for ticks are very sensitive to heat.

The answer above is incorrect. Irritating the tick is not beneficial. Simply pull the tick off. Ticks actually "glue" themselves onto you. A gentle tug will work.

Irritating a tick will only makes it regurgitate its body fluid (which is where the disease is). And don't be so worried about not getting the head off. The worse scenario is that a local infection will develop. The actual disease (ie Rocky Mt spotted fever or Lyme disease) is in the fluid in the body.