Nonepidermolytic palmoplantar keratoderma (NEPPK) is an autosomal dominant skin disorder that manifests as keratosis of the palmar and plantar surfaces surrounded by erythema. NEPPK is divided into the focal form (FNEPPK), the focal or diffuse form (PPKNEFD), the diffuse Bothnian form (PPKB), Nagashima form (PPKN), and so on.
