Yellow, green, red, brown, Once up high now on the ground

Beneath the flesh, I quietly lie. A framework that will never die. When life retreats and all is bare, I'm the final form, forever there.

Some call me a king, while others, a bug. I own a pair of wings that carry me far above.

You might use me to make your bets less risky, or make a maze with me if you're feeling tricky, finally when mixed with a hog you'll find the result quite prickly. What am I?

Always in you, sometimes on you, if I surround you I can kill you.