What is an inverted follicular keratosis?

Updated: Jan 30, 2020
  • Author: Ginard I Henry, MD; Chief Editor: Gregory Gary Caputy, MD, PhD, FICS  more...
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Irritated seborrheic keratosis is one subtype, characterized by a predominance of basal cells but with whorling sheets of squamous cells. This squamous metaplasia is a consequence of irritation and requires careful discrimination from basosquamous carcinoma. A dermal lymphocytic infiltrate also may be observed, corroborating the inflamed irritated variation.

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