A previously healthy 30‐year‐old man of European ancestry presented to hospital in August 2017 with a one‐week history of fevers and vomiting followed by painful mouth and throat and erythema and swelling of his hands and feet. His general practitioner treated him with oral penicillin for presumed streptococcal pharyngitis, with minimal improvement. His symptoms progressed to non‐suppurative bilateral conjunctivitis; desquamation of his scrotum, face and fingertips; and arthralgias in both hands.