Palmoplantar keratoderma (PPK) is a complex group of hereditary syndromes that have been classified into diffuse, punctate, and focal forms according to the pattern of hyperkeratosis on the palms and soles (Lucker et al., 1994).
For a discussion of phenotypic and genetic heterogeneity of palmoplantar keratoderma, see epidermolytic PPK (144200). [from
OMIM]