What are the mechanics of itching?

My understanding is that when something, say a mosquito, bites you it irritates the skin sending messages to your brain to trigger a need to scratch the spot. You scratch it which scrambles the irritation and the spot sending the messages. As the irritation reassembles again it sends messages again causing you to scratch again. It keeps going on until the irritation goes away or until you put a medication on the spot which causes the irritation to stop in which no more messages and so no more scratching. **AT PEACE WITHIN** ~~STAND STRONG IN YOUR BELIEFS~~

From what I have found online, itching is a built-in defense mechanism that alerts your body to the potential of being harmed. Once the stimuli lands on your skin and scratches the skin's surface layer, receptors in the dermis will get irritated and send signals through the fibers of your skin to the cerebral cortex in your brain via your spinal cord. The first natural response is to scratch the skin to remove the irritant as quick as possible. Sometimes that irritant is truly removed and the itching stops. Other times, the pain sensation that you are causing by scratching it interrupts the itchy signal so you will temporarily believe that it no longer itches. Hope that helps!

I was told as a child that an itch was a baby pain. I checked that out and here is what I found: It used to be thought that the sensation of itching was caused by low level stimulation of the nerves responsible for feeling pain. Like pain, the feeling of itchiness is delayed slightly from the event that causes the pain or itch. But both sensations lead to different responses. Pain leads to a reflex action that removes us from the source of injury while an itch causes us to scratch. Interestingly, scratching too can be a reflex reaction that needs no input from the brain. http://www.ratlab.co.uk/itch.htm

I experinced that before, because of the environment i have, like a 'dust' i was very allergy and sensitive of that, but when i go to the doctor he gave me a cure for that allergy... the best advice is to consult the doctor, do you think this is a good advice?