What works to kill/prevent no see-ems/mosquito bites?
We use a homeopathic gel called "Ssting-Sstop" by B&H. It doesn't prevent bites or stings but for many folks it is remarkable in reducing the pain and itching after-the-fact.
Well, it depends on what the meaning of "Sting" is!
wound or pierce with a sting.
"he was stung by a jellyfish"
synonyms: prick, wound, bite; poison
"she was stung by a scorpion"
feel or cause to feel a sharp tingling or burning pain or sensation.
"her eyes stung"
synonyms: smart, burn, hurt, be irritated, be sore
"the smoke made her eyes sting"
So it helps with the latter but not the first.
BTW- I just tried it and it soothed me from your rejoinder!