Snap Shot A 25-year-old woman has moderate tearing pain in her left eye. She was recently placed on topical corticosteroids for suspected allergic conjunctivitis. A gram stain and Giemsa stain are negative for organisms. A fluoroscein stain of the eye exhibits a shallow ulcer with a dendritic appearance and irregular borders. Introduction Infection of the conjunctiva by HSV typically following vesicular eyelid eruption herpes labialis may or may not be present Corneal involvement is often precipitated by topical or systemic corticosteroid treatment Evaluation Fluoroscein stain examination exhibits a shallow ulcer with a dendritic appearance and irregular borders Treatment Topical antivirals idoxuridine vidarabine trifluridine