I second this about spider bites. Many spiders are venomous (it's how they kill their prey after all) but only a very few have fangs that are capable of getting through our tough skin. It drives me nuts when people claim they have spider bites. No such thing. (At least here in the US.)
But I do wonder about what causes all those little bites. Nothing fazes me, I never swell up when I get skeeter bit, ticks barely leave a mark, and I seem to be able to avoid chiggers. My poor husband, however, gets dozens of bites...from something...every time he goes outside. We were backpacking in February (in the Missouri Ozarks) and he must have had 15 bites! So weird how one person can be covered and another completely unaffected. And I don't think they're little infections because it's pretty consistently an outdoors thing, even if he's out for a few minutes. Strange. There must be more bugs biting than the usual suspects.