Saltydog235...
... my grandfather had a friend, when I was a kid, who had a trait I really envied: Mosquitos didn't like his blood.
Not sure if it was his choice of tobacco, his diet, or what, but we'd be on a trail, on a bank, or in a boat, and mosquitos and black flies would swarm everybody - but none would bite or even land on Bill.
Interesting guy, though. Former Navy Atlantic Fleet heavyweight boxing champion (1930's timeframe). Handloaded custom ammo for rifle competitors, did some light FFL work. Great big guy, booming voice, scared the heck out of me when I was little, until I grew old enough to realize he was just an enormous teddy bear.
He stayed an avid outdoorsman into his 70's. What finally took him down was his last deer hunt. He got tired of dragging a buck through Maine undergrowth, so he just hefted it over his shoulder and started carrying it. This was actually working ok for him, until he stumbled on a decline and fell, with the deer on his back. He never quite recovered from the fall down the hill.
But anyway, bugs would not bite or land on the guy. Wish I could bottle that. I'd be past rich.