Swelling and flush after a mosquito bite?

Why is it that we get swelling and blush around the area after a mosquito bite? Why is it that sometimes the nouns of red/swelling is bigger sometimes and just a dot other times? Also, why does it itch so fruitless?Swelling and flush after a mosquito bite?
My Dr. told me that the itchy spot is an allergic reaction to mosquito saliva. He said near are different "breeds" of mosquitos and they each hold a slightly different chemical makeup to their saliva, so some cause more (or less) allergic reaction in different ethnic group.
It depend how long they were on your skin and how much anesthetic they used..
When the mosquito bites us, it drinks our blod by piercing its proboscis into our blood capillary. Bcoz of that our capillary swells and we be aware of like itching at that spot.( you may be knowing this) If it drinks more blood the swelling may be larger. U should consult a doctor if its cause u problems. it could be bad s'metimes. (hey i'm not scare u OK)