Answer:
My first is an insect; my second is a border; my whole puts the face in a tuneful disorder.
Turn us on our backs and open up our stomachs you will be the wisest of men though at start a lummox.
There are millions of me. I am very small but when moving fast I am deadly.
Take off my skin, I won't cry, but you will.
I walked and walked and at last I got it. I didn't want it. So I stopped and looked for it. When I found it, I threw it away.
It is an insect, and the first part of its name is the name of another insect. What is it?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?