Clay-like layer on my back

When my back is sweaty and I scratch it, I get this white clay-like stuff under my fingernails what could this be?

Answer #1

You’re male - we get a lot of grease on our backs. It’ll be a mixture of dead skin cells and grease. You just need to wash it (:

Answer #2

Could it be skin cells? doesn’t sound good.

Answer #3

skin, and chemicals

Answer #4

Sweat, dirt and oil, probably.

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