I've had a bug on the back of my head for a couple years now. In summer, I get them on my shoulders and lower legs, feet. Those tend to bite. Get the dripping water thing too.
Weird thing is, I don't ususally feel it if a real bug is on me. The other day, a fire ant got me - didn't feel him crawling on me or biting, but that stung for a while after. Then I had the creepie crawlies all night, ugh.
This thread is making me itch.