Why Does Derma Roller Only Regrow Thin Hair?

Zach Loar

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My Regimen
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Been using a .5mm derma roller since May 18th, 2019. It has regrown in the corners of my hairline and also the sides of my head (above my sideburn which I don't know what that thing is called), BUT it's regrown THIN hair and not thick hair. I derma roll everyday... Am I doing anything wrong?
 
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