A severed mosquito proboscis can be turned into an extremely fine nozzle for 3D printing, and this could help create replacement tissues and organs for transplants.
I’ve linked to a decent write-up on Tom’s Hardware, but New Scientist covered it last week too.
Source paper: 3D necroprinting: Leveraging biotic material as the nozzle for 3D printing (science.org)
If it makes you feel better, the people who stick their arms in aren’t allergic to mosquito bites. Doesn’t bother them to get bit beyond the feeling of being bit.
I mean I guess it could happen that they are just masochistic, but typically not.