A 16-year-old boy comes to the physician because of a rash on his left inner thigh that first appeared 2 days after he returned from a hunting trip with friends in Minnesota. A photograph of the rash is shown (bulls-eye). Without treatment, this patient is at increased risk for which of the following?

A) Secondary bacterial infection
B) Osteomyelitis
C) Thromboembolism
D) Chronic fatigue syndrome