Use toothpaste, only on that area and leave it overnight, then in morning wash it off. The toothpaste will dry up the pimple and will destroy it if you do this every night until it goes away. I know because I have done this before.
$WARNING$ DO NOT COVER YOUR FACE WITH THE TOOTHPASTE LIKE IT'S A TREATMENT FOR THE PIMPLE!!!!!!!!
To get rid of big pimples, you have to wash your face gently using a facial cleanser and dab some acne astringent on a cotton ball. Then you apply acne mask liberally on the pimple. Check out http://www.ehow.com/how_5509314_rid-big-pimples.html for more information.