Why does it hurt when you put sharpie on your skin & then take a picture with flash on the iPhone?

Okay, so there s this thing at my school where you do this: 1. Draw a black sharpie square on your hand 2. Take off your phone case 3. Put your phone camera directly on the skin where your sharpie mark is 4. Turn on the flash on your phone and then take a picture. It hurts and stings a little bit. It s like a... show more Okay, so there s this thing at my school where you do this:
1. Draw a black sharpie square on your hand
2. Take off your phone case
3. Put your phone camera directly on the skin where your sharpie mark is
4. Turn on the flash on your phone and then take a picture.
It hurts and stings a little bit. It s like a small shock. Why is that?
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