A Rare Case of Juvenile Psoriatic Arthritis

This is a case report of a one-year-and-nine-month-old girl with multiple guttate psoriasis skin lesions, non-traumatic knee arthritis, and no family history of autoimmune diseases. Laboratory tests revealed no suggestive markers of juvenile psoriatic arthritis (JPsA), while the dermatological examination described scaly erythematous lesions with a positive Auspitz sign. The diagnosis was confirmed by a skin biopsy and histopathological examination. The psoriasis lesions were preceded by the onset of arthritis within two weeks. The negative family history, age of onset, clinical presentation, and negative antinuclear antibodies make it a particular case of JPsA.