Description : Pityriasis rubra pilaris is an uncommon skin disorder characterized by the appearance
of keratotic follicular papules, well-demarcated salmon-colored erythematous plaques
covered with fine powdery scales interspersed with distinct islands of uninvolved
skin, and palmoplantar keratoderma. Most cases are sporadic, although up to 6.5% of
PRP-affected individuals report a positive family history. The rare familial cases
show autosomal dominant inheritance with incomplete penetrance and variable expression:
the disorder is usually present at birth or appears during the first years of life
and is characterized by prominent follicular hyperkeratosis, diffuse palmoplantar
keratoderma, and erythema, with only a modest response to treatment (summary by Fuchs-Telem
et al., 2012).;
Inheritance : Autosomal dominant;
Molecular basis : Caused by mutation in the caspase recruitment domain-containing protein 14 gene (CARD14,
607211.0006);