why scratching sunburn makes the skin turn white, when scratching unburnt soon turns red.

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So I’m very red right now, usually white. (Thanks sun.) And noticed white streaks on my legs from where I scratched. I get why scratching skin would make blood flow there, but why would sunburn make the opposite happen?

In: Biology

Pressing down on sunburn pushes the blood away. When you stop pressing it turns back to red (rather slowly sometimes).