why does it feel good

why does it feel so damn good to scratch a mosquito bite? i want to know the biology behind it but i'm too lazy to look on the internet, well, i'm too busy scratching the bottom of my foot which is where the mosquito bite is. i got it when i was sleeping, or when i was eating a restaurant (where we took our shoes off and sat at the table on the floor). it feels so good and it's so addictive - scratching a mosquito bite.

OMG, so i looked it up online and Bill Nye the Science Guy has an answer (I HEART the Internet). *reads article* oh well, the article wasn't very clear on why it felt good to scratch an itch.

so it turns out Men's Health ("Tons of Useful Stuff" slogan) had, well, some useful stuff on this topic in an article called Stop Your Itchin':
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Why does scratching work, at least temporarily? "The brain can process only one signal of sensation at a time from a particular location in the skin," explains Dr. Nasir, "and by providing another type of irritation, we can suppress the itch." He also points out that scratching generates heat, "and if you heat up the nerves that cause itching, you can suppress it."

Which leaves the issue of why scratching feels so dang good. If you follow the "human urge to scratch, you're going along a well-trodden neurological pathway that is hardwired into the brain. It's very satisfying," Dr. Nasir says. Medicines or tricks (see below) that suppress itching are sometimes "not as gratifying." That shudder of pleasure may be from a "release of endorphins that give you a natural high," he says.
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well, there it is, my answer: endorphins. seems to be the answer to a lot of questions that start out, "why does it feel so good to do .... "