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

Question

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?

Jeff Donovan, MD, PhD · Answer

This is a great question but a fairly complex one too. No, the dermatoller does not give false positive diagnosis, but it is still possible you have a false positive diagnosis. AGA gives inflammation and scarring (loose concentric fibrosis). Unless an expert dermatopathologist is reading your slide and unless an expert hair specialist is interpreting it all - it can be incredibly confusing. A biopsy stating LPP does not always mean the patient has LPP!

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

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

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