An unusual case of generalized hyperkeratotic and verrucous porokeratosis - Johann de Wet, MBChB, MMed (Derm); Minette Swart, MBChB, FCDerm; H. Francois Jordaan, MBChB, MMed (Derm); Johann W. Schneider, MBChB, MMed (Anat Path); Suzanne Mulder, MBChB; Willem I. Visser, MBChB, MFamMed, MMed (Derm) (Elsevier, 2020)