I was bit on the back of the hand by an insect 2 days ago. There is a bump that has decreased in size every day, no pain unless I hit or squeeze the back of my hand. The skin on the back of my hand is turning dark. Do I need to be seen?

What are you doing ask for medical advice here?

If you are not sure call the KP 24 nurse hotline and they can discuss your symptoms. They are much more medically trained than an average google reviewer.

Yes sounds like something is affecting your circulation

I would get something like that looked at right away I had a wound on my foot and was bit by a bug and ended up with maggots in my foot so anything can happen