Is it bad that my iPhone 5 charger heats up really quick?

I charge my phone with the normal USB charger, and I plug it into a plug that connects to a wall, but I put it on a extension coord. But after 10% of charging (using it or not) the plug gets really hot, and when I disconnect the USB from the plug side, the metal part feels really hot (it hurts to touch it).It's been going on for a few months, but I don't see anything burnt.

No, It just means that it's doing a lot of charging. I have and iphone and I used to have an android and both chargers would get hot after a short period of time.

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