This question is probably best addressed to the McCann family

Theres been a mosquito in my apartment for the past few nights, the bugger has been biting my ankles and legs when Im asleep. I opened my eyes this morning and saw the blighter on the wall, so I went to swat it, it attempted to fly away so my swatting hand gathered imense force.
The end result was a fat mosquito and a 4 inch blood stain on my lovely just-painted walls.
How do I get rid of the blood stain without effecting the paint?