When can I dermaroll after bumping my head into the computer screen?

Lamps

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Hello, when can I dermaroll after bumping my head into the computer screen? About 36 hours a go I bumped my head into the computer screen, it hurt when the bump happened. I got a fine line of blood in my forhead after the bump. However, I have not gotten any headache after the bump into the computerscreen. When is it safe for me to dermaroll on my head again? I have the option to use a 0,5 mm, 1 mm or 1,5 mm dermaroller. Thanks for answering.
 
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