Palmoplantar keratoderma, Bothnian type (PPKB) is one of the non-epidermolytic palmoplantar keratoderma. PPKB was initially reported to be prevalent in the north of Sweden, along the Gulf of Bothnia. The clinical characteristics of PPKB include diffuse, homogeneous, and even palmoplantar hyperkeratosis with swollen stratum corneum, which distinctively exhibits a whitish spongy appearance upon exposure to water. PPKB is the autosomal-dominant disorder caused by mutations in the aquaporin 5 gene, AQP5.
Category
Congenital malformation
Brite
Human diseases in ICD-11 classification [BR:br08403]
14 Diseases of the skin
Genetic and developmental disorders affecting the skin
EC20 Genetic disorders of keratinisation
H02266 Palmoplantar keratoderma, Bothnian type