An adolescent boy presented to the hospital with bilateral eye redness, an erythematous chest rash, lip blistering, and worsening sore throat for 2 days while undergoing a 10-day outpatient treatment course of ciprofloxacin and trimethoprim-sulfamethoxazole for community-acquired pneumonia. He complained of a cough, sore throat, and ocular itching. He denied prior ocular history and reported no visual changes. He had no significant medical history aside from documented allergies to β-lactam, macrolide, and cephalosporin antibiotics resulting in rashes, angioedema, and hives.The patient was febrile on admission, and results from chest radiography were consistent with pneumonia. Bedside ophthalmic examination revealed bilateral limbus-sparing conjunctival hyperemia that blanched minimally with phenylephrine, bilateral nasal and temporal conjunctival epithelial ulcerations, and inferior forniceal pseudomembranes (Figure , A). There were no symblephara or eyelid margin defects. Examination of the face revealed erosions with hemorrhagic crusts on the lip mucosa (Figure , B) but no associated cutaneous lesions or desquamation. Findings from the remainder of the ophthalmologic examination, including visual acuity, intraocular pressure, and dilated fundus examination, were unremarkable. Mycoplasma pneumoniae IgG and IgM titers were obtained and found to be within normal limits.