My iPhone 5 charger burned me?

I was laying in bed and felt a burning sensation at the bottom of my back, it was very sudden and very hot. I immediately checked my back and there was a black blister and my iPhone charger was also black on one side, I assume it is my burnt skin. I wasn't laying there for long as I had taken my phone off the charger to use it.

Does anyone have any advice on what I should do about it? The charger, not the burn

If it's an apple one take it in and complain

If it's Chinese cut it in half throw it in an outside bin and buy a proper one

Same thing happened to my arm. Three months later, I still have a scar.