This is a dream of very ill omen and it shows that you are in danger of suffering ill from the hands of someone who has wished you harm for a long time. It also a wish to undo something that you may have done that is past being repairable, as well as a warning of physical harm and monetary losses.
If you dream of being bitten by a vampire this shows there is someone in your life that is draining you, or your resources, and you need to eliminate this person from your life.... Encyclopedia of Dreams
Mosquitoes attacking your body might arrive in a dream as a response to negative influences in your environment. They may point out that someone is feeding on your life force and leaving a swelling imtation.
A mosquito may appear to advise that you stop letting others suck your blood.
Symbol: Mosquitoes, flies, and snakes are representations of the devil.
Vision: If mosquitoes are buzzing about your head: you are too generous and others are taking advantage of you; also you might have a troublesome visitor. Getting bitten by a mosquito: the friends you selected turned out to be bad company. Things will get unpleasant, but your regrets are too late.
The people you invited will bring much stnfe into your house.
Depth Psychology: See Flies, Insects.... Dreamers Dictionary