Porokeratosis is a disorder of keratinization showing a well-defined lesion with a hyperkeratotic ridge on the border that contains the coronoid lamella. We report familial (autosomal dominant with reduced penetrance) disseminated plaque type (Mibelli's type) porokeratosis in a father and son. In the father, there were multiple horns and a large squamous cell carcinoma in a large lesion over th...

Abstract A 45-year-old man with a history of psoriasis presented to our male genital dermatology clinic several-year pruritic, painful, hyperkeratotic red–brown plaques on both buttocks. He had previously been treated unsuccessfully cryotherapy and topical imiquimod podophyllotoxin for suspected condyloma acuminata. 4-mm punch biopsy from the left buttock showed hyperkeratosis, hypergranulosis,...

Only 6 cases with an association of disseminated superficial porokeratosis with dermal amyloid deposits are reported in the literature. We present the case of a 76-year-old woman who presented with a disseminated superficial porokeratosis. Histological examination revealed amyloid deposits in the upper dermis, which were typed with routine HE stains, Congo red stains and anticytokeratin antibod...

be associated with porokeratosis,[8] this diagnosis was not considered owing to the lack of typical clinical features and histology of this condition. Authentic clinical and histologic features of Nekam’s disease are, respectively,[9] a facial seborrheic dermatitislike eruption with tiny confluent papules on the trunk and extremities in linear and reticulate arrays and an infundibulocentric and...

Porokeratosis is a genodermatosis characterized by abnormal epidermal keratinization with the histological feature of cornoid lamella. There are many clinical variants, but two or more of these variants rarely occur in a single patient. This variation in clinical presentation may be due to the different phenotypic expression of a common genetic abnormality or may be the consequence of abnormali...

Porokeratosis is a specific keratinization disorder that manifests clinically as well-demarcated annular or linear keratotic plaques of various sizes and forms and with distinguished histology showing cornoid lamella, which is a column of closely packed parakeratotic cells extending through the stratum corneum. Nail changes secondary to porokeratotic lesions involving digits are quite uncommon ...