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QUESTION OF THE WEEK

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Punch Biopsies & Pencil Erasers

Scalp Punch Biopsies

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Punch biopsies are performed when the diagnosis of a patient’s hair loss is not clear.

Patients frequently ask “how big of a piece are you going to take?” A punch biopsy for hair loss should normally be 4 mm in size - which is a bit smaller than the typical 5 mm pencil eraser. 

This article was written by Dr. Jeff Donovan, a Canadian and US board certified dermatologist specializing exclusively in hair loss.


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