A 17-year-old boy has pus-filled cysts on his face and upper back.Microscopic examination reveals Gram-positive rods.This infection is caused by

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Pus-filled cysts on the face and upper back are characteristic of acne, which is commonly caused by Propionibacterium acnes. Gram-positive rods are a key feature of P. acnes. Herpes simplex virus, Staphylococcus aureus, and Streptococcus pyogenes are not typically associated with acne.

A 17-Year-Old Boy Has Pus-Filled Cysts on His Face and Upper