Snapshot A 20-year-old student presents to the school’s health clinic complaining of a scaly rash on his trunk. He recalls having a mild fever and headaches a few weeks prior, but did not think much of it. The lesions do not itch. He loves to play tennis and spends a lot of time outdoors and wear proper attire during activities. On exam, the lesions are primarily on his central trunk. His sun-exposed arms have no lesions on them. Introduction Common, self-limited papulosquamous eruption login to view 4 more bullets Epidemiology Children Young adults Rare above 35 years of age ETIOLOGY Pathogenesis login to view 4 more bullets Presentation Symptoms login to view 2 more bullets Physical exam login to view 11 more bullets Evaluation Diagnosis from clinical exam and history Diagnosis confirmed with skin biopsy login to view 1 more bullet If sexually active and palms and soles involved login to view 1 more bullet Differential Tinea corporis Secondary syphilis (esp if palm and soles involved) Tinea versicolor Drug eruption Guttate psoriasis Treatment Observation login to view 1 more bullet To hasten recovery login to view 2 more bullets If itchy login to view 2 more bullets Complications Post-inflammatory pigmentary changes Relapse Prognosis Very good Typically self-limited and self-resolving in 4-12 weeks