well, its either; poisonous, your allergic to it or its just got infected. so yes, it would be a good idea to see a doctor
Neither it itches
The insect's sting's cure will be caused if we apply a soaked wet pad of ammonia water.
Mimesis. If you look like a stinging insect, other creatures treat you like a stinging insect, without the biological overhead of actually having to grow a stinger and produce toxin.
Hornet
bee
calamine lotion
Yes it does, you should go to the doctor immediately.
Wasp?
Blood vessels will expand to keep the bite from bleeding. This expansion of blood vessels can irritate nerves that are nearby which causes the insect bites to sting and/or itch.
I wouldn't recommend taking anything unless it is prescribed by a doctor. The effects of the sting will pass and there should be no lasting harm.
Tarantula Hawk Wasp
Because of the venom that has been injected in your skin.