Research says that every body including animals's skin produce chemicals.These chemicals are the mixture of different compounds. These mixture produce ordour .This ordour is different in different people. And these chemicals are responsible to attract or repell insects specially mosquetos.
"People with high concentrations of steroids or cholesterol on their skin surface attract mosquitoes," Butler tells WebMD.

Now scientists are working on these chemicals to produce mosquito repallent lotion.
"One in 10 people are highly attractive to mosquitoes," reports Jerry Butler, PhD, professor emeritus at the University of Florida .Incidentally, it's not dinner they're sucking out of you. Female mosquitoes - males do not bite people - need human blood to develop fertile eggs. And apparently, not just anyone's.

Mosquitoes also target people who produce excess amounts of certain acids, such as uric acid, explains entomologist John Edman, PhD.and also people who emit large quantities of carbon dioxide.
"Any type of carbon dioxide is attractive, even over a long distance," Conlon says.he also said Pregnant women are also at increased risk, as they produce a greater-than-normal amount of exhaled carbon dioxide. Movement and heat also attract mosquitoes.

Some of the worst mosquito populations exist along coastal areas, Conlon tells WebMD. And being several miles inland does not guarantee your safety from the pests. "They'll fly 40 miles for a meal," Conlon says.

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