by 
BadBoy
ANSWERS: 4
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Researchers at Kansai University in Osaka suggest the mosquito's bite is painless because it's proboscis is highly serrated. Syringe needles are smooth, and leave a lot of metal in contact with skin tissue. But the mosquito's proboscis leaves only small points in contact, reducing the stimulation of nerves. Taken from : http://news.bbc.co.uk/1/hi/health/1909086.stm which has more :-)
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I've felt mosquitos biting before.
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A mosquito injects his saliva into the skin, and it acts as an anesthetic, so you don't feel them sometimes.
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I feel them sometimes. It probably escapes our attention at other times because of all the other stimuli affecting our skin at the same time such as weather, clothing, hair maybe.
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