Generalized Lesions of Kyrle's Disease: A Rare Case.

Kyrle's disease (KD) is a rare type of acquired perforating dermatosis (APD) associated with various systemic diseases, particularly chronic kidney disease and diabetes mellitus (DM). It most commonly occurs at the lower extremities. Generalized lesions of KD are rare. We report a case of generalized KD in a 29-year-old woman with chronic kidney disease and DM. Physical examination revealed multiple hyperkeratotic and hyperpigmented papules, plaques, and nodules with central umbilication and keratotic plugs on almost all parts of the body. Histopathological examination showed keratinized epithelial layer with acanthosis and hyperkeratosis, invagination with the formation of keratin plugs, and basophilic cell debris accompanied by parakeratosis and abnormal keratinization of epithelial cells. These histopathological findings fulfilled the Constantine and Carter criteria for KD. This condition is characterized clinically by umbilicated, round, erythematous or hyperpigmented papules and nodules with central crusts or keratotic plug, predominantly involving the extensor surfaces of the extremities and the trunk. Although uncommon, it may also involve the face or the scalp. Nevertheless, generalized lesions involving faces are rarely found in KD.