Clinical features of pseudoporphyria. (a) Crusted erosion on the tip of the nose of a 4-year-old boy with JIA-EOPA. The lesion occurred 6 months after the start of naproxen treatment. (b) Thirty-two months after discontinuation of naproxen the lesion appeared as irregular, light erythema. JIA-EOPA: juvenile idiopathic arthritis, early-onset pauciarticular subtype.