Sud, A.Shipman, A. R.Odeke, M.Varma, K.Read-Jones, M.Carr, R. A.2024-11-042024-11-042017-07-27Sud A, Shipman AR, Odeke M, Varma K, Read-Jones M, Carr RA. Follicular porokeratosis: four new cases. Clin Exp Dermatol. 2017 Dec;42(8):881-886. doi: 10.1111/ced.13195. Epub 2017 Jul 27.0307-69381365-223010.1111/ced.1319528748571http://hdl.handle.net/20.500.14200/6358Porokeratosis, a disorder of keratinisation, is clinically characterized by the presence of annular plaques with a surrounding keratotic ridge. Clinical variants include linear, disseminated superficial actinic, verrucous/hypertrophic, disseminated eruptive, palmoplantar and porokeratosis of Mibelli (one or two typical plaques with atrophic centre and guttered keratotic rim). All of these subtypes share the histological feature of a cornoid lamella, characterized by a column of 'stacked' parakeratosis with focal absence of the granular layer, and dysmaturation (prematurely keratinised cells in the upper spinous layer). In recent years, a proposed new subtype, follicular porokeratosis (FP_, has been described, in which the cornoid lamella are exclusively located in the follicular ostia. We present four new cases that showed typical histological features of FP.enDermatologyArticle