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What causes skin to do this?

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Okay, my sister showed me something cool that you can do with ice and salt. You first wet your skin and cover the wet area with salt. Then, you press down on it with a cube of ice for about a minute. It stings a litle bit, but when you take the ice off, the area is cold, hard, and white. After about 20 seconds it turns softer and red and puffy. I did it to myself for several minutes and it turned into a welt.

Does anyone know what causes skin to react that way with salt and ice?