Hereditary palmoplantar keratoderma, Gamborg-Nielsen type is characterized by the presence of diffuse palmoplantar keratoderma without associated symptoms. The syndrome has been described in multiple families from the northernmost county of Sweden (Norrbotten). The palmoplantar keratoderma found in the Gamborg-Nielsen type disease is milder than that found in Mal de Meleda but more severe than that found in Thost-Unna palmoplantar keratoderma. Transmission is autosomal recessive. The disease is hereditary palmoplantar keratoderma, Gamborg-Nielsen type (MONDO_0009489). Also known as: PPK, Gamborg-Nielsen type, hereditary palmoplantar hyperkeratosis, Gamborg-Nielsen type.