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A 9-month-old boy was seen for a localized skin rash on the abdomen and extremities that had spread rapidly over the preceding 2 months. The patient had no other associated symptoms. His clinical history included multiple episodes of pyelectasis that had been treated with prophylactic antibiotics (cefadroxil) up to 5 months of age. Before the skin lesions appeared, the patient had undergone antibiotic and corticosteroid treatment for multiple viral and bacterial infections of the upper respiratory tract. Physical examination revealed confluent salmon-pink papules and plaques on the trunk and extremities (Fig. 1A), with islands of healthy skin on both legs. Biopsies of the lesions showed acanthosis, hypergranulosis, orthokeratosis, parakeratosis, and mild superficial infiltrate, findings consistent with pityriasis rubra pilaris (PRP) (Fig. 2). The patient was treated for 1 month with topical 0.05% triamcinolone acetonide cream, which resulted in complete resolution of the lesions (Fig. 1B). Due to the patient’s clinical history of recent respiratory infections, the early resolution of the skin lesions, and the histological findings, a diagnosis of acute postinfectious PRP was proposed. PRP is a skin disease that rarely affects children. In 1980, Griffiths proposed a classification system that divided PRP into 5 categories according to clinical and epidemiological features and clinical course. Variants that occur in children include classical juvenile (type III), circumscribed juvenile (type IV), and atypical juvenile (type V) PRP. In 1983, Lar-

Pitiriasis rubra pilaris aguda postinfecciosa: gran respuesta a emolientes y a corticosteroides tópicos