[okreallywtf]

In a similar vein, supposedly a lot of "spider bites" are not spider bites (according to source): https://www.livescience.com/37974-he-surprising-cause-of-mos...

I've known people to theorize that many small welts are caused by spider bites even though they didn't see the spider or know when they got bitten.

[dwyerm]

If clicking something with a clickbaity name isn't your thing, I can save you a click. The cause is "more likely to be bites or stings from other arthropods such as fleas, skin reactions to chemicals or infections."

[bradknowles]

Bedbugs?