I have been stung at in on pretty much every conceivable part of my body. Most stings do not get much more attention than a mosquito bite. However, I will tell you the two worst, most painful and I am meaning unrelenting sustained pain, places that I have been stung. For considerations, I am male, and is not where you think.
#1 - IN the nose. Imagine Up inside, just out of reach of the pinky finger nail, in the membrane, cartridge side. Make the biggest toughest grown man cry instantly, incessantly, and suffer so for 4 days.
#2 - IN the ear canal. A close runner up.
#3 - Tip of the nipple. A distant third but highly attention getting mentionable.
...
... far down the list
#15 anywhere in the crotch areas.
I have not had the displeasure of the tear duct. Closest has been into the eyeball itself. That was a real trip! Own personal built in kaleidoscope lit up. Was really kool. Though very scary wrt potential for permanent nerve damage.