impetigo

A 9-month-old male presents with a rash and fever for 4 days. Mom reports the rash began in the axillae and groin and spread to the trunk. She notes the rash started as small, erythematous lesions that have progressed to bullae which are unroofing. The rash is associated with intermittent fevers (Tmax of 102°F) and diarrhea. The patient’s vital signs include T 101.2F, BP 93/56, HR 163, RR 40, SpO2 of 99% on room air. On physical exam, the patient appears pale with a prolonged capillary refill. His skin exam is significant for an erythematous rash with scattered ruptured bullae with brown crust and a collarette of scales across the trunk, axillae, perineal and flexural thigh areas. What is the diagnosis?