[Pyoderma gangrenosum in an infant: Case report].

Pyoderma gangrenosum (PG) is a rare neutrophilic dermatosis of unknown etiology, characterized by ulcers, especially on the lower limbs. There have only been 13 cases of PG in infants (<12 months old) reported in the past 25 years. We report the case of a 9-month-old child with ulcers on the right leg diagnosed as pyoderma gangrenosum. Tissue cultures for bacteria, mycobacteria, and fungus were negative. The child was treated with prednisone 1 mg/Kg/day for 30 days, with complete healing of the lesions during this period. No underlying diseases have been identified in the last two years, but the child is still being followed.