Ecthyma gangrenosum is a cutaneous manifestation of Pseudomonas infection that confusing to diagnose due to similarities with other pathologies and that can have devastating consequences for the patient and even cause death. A case of a healthy infant with lesions in the 5th toe without systemic compromise corresponding to ecthyma gangrenosum caused by P. aeruginosa, diagnosed by Wood lamp and the patient’s good fast answer to the specific antibiotic treatment. This case is typical of the local variety without neutropenia nor septicemia, as observed in healthy patients.