Spend more time with them. I grew up in the tropical Fijian bush and never noticed mosquitoes. I left for a few years and when I went back, every mosquito bite

Spend more time with them. I grew up in the tropical Fijian bush and never noticed mosquitoes. I left for a few years and when I went back, every mosquito bite left an itchy red bump that sometimes got infected (turned into a boil). After a couple of weeks of this, I redeveloped my resistance to them and no longer even notice them anymore. Of course this doesn't apply if there's an ongoing mosquito-borne epidemic in your area, but that doesn't happen often. When they're not carrying a disease (which is most of the time), they're pretty harmless.