If you seem to be the target of bloodsucking attention, there are two biological systems you can blame — your microbial flora, and/or your immune system. Your particular mix of skin bacteria play a big role in determining how well mosquitoes can smell you (and whether you smell delicious). Meanwhile, your immune system controls your allergic response — or lack thereof — to mosquito bites. If you never get red welts to go with the biting, it's easy to think that you're not getting bitten as often as someone who does.
Why do mosquitoes prefer to eat some people over others?
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