Squamous Cell Carcinoma Arising from Linear Porokeratosis in a Young Chinese Man

Porokeratosis is a specific disorder of epidermal keratinization, characterised histologically by the presence of cornoid lamella1. Linear is a distinct, mosaic variant of this autosomal dominant condition. There is a well recognized association between porokeratosis and malignancy, especially the linear variant which has the highest malignant potential2, 3.