Can Derma Roller give a false positive for LPP (Lichen Planus Pillaris)?

I recently had a biopsy done of my balding crown. to my dr. and my surprise it came back positive for LPP (Lichen Planus Pillaris). He said he was puzzled because normally people who have LPP have a rash and other stuff. he said I had a few pimples in the are but noting that looked out of the ordinary. I used the derma roller on my crown for around 6 weeks to increase minoxodil absorbtion. do you think that can trigger a false positive since it creates scar tissue?