[Mibelli's porokeratosis]. / Porokeratoz Mibelli.

A 44-year-old patient suffering from porokeratosis of Mibelli for 27 years is described. The eruptions have involved the skin of the buttocks and the upper and lower limb flexor surface. The clinical picture of the disease may be regarded as the classical plaque form. The clinical diagnosis has been confirmed by a characteristic histologic picture with invagination of the corium mass into the epidermis (corniculate plates). Electron microscopy has shown a number of shifts in the epidermis sites adjacent to the corniculate plate and above it. The proliferative activity of the epidermis was enhanced but the keratinization processes round the corniculate plate was unchanged.