Answer to the Hurt Red but Blue Riddle

Answer to the Puzzle of the Day 2198 : Hurt Red but Blue Riddle
Here is the refresher to the puzzle

Riddle :

I’m blue under, but when you see me I am red.
You don’t see me often.
I’m there for you if you’re hurt, but I’m good for you.

What am I?

Now the Answer : 

Answer : Blood
Explanation : Blood under our skin in veins appears blue (as human tissue reflects blue and not red light). But its real color is red. You don’t see it often. When you are hurt, it comes out. Right blood is good for humans

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