Snapshot Pityriasis rosea 1 A 10-year-old boy is brought to his dermatologist for a developing rash. A couple of weeks ago, he recovered from a common cold. A week after, he developed an oval rash on his chest. Thinking it was a fungus infection, his parents applied anti-fungal cream to the area. However, a week after the first lesion appeared, he developed multiple smaller rashes in his lower abdomen. They are sometimes itchy, but only mildly so. Introduction Common, self-limited papulosquamous eruption Pathogenesis login to view 4 more bullets Epidemiology login to view 2 more bullets Presentation Symptoms login to view 2 more bullets Physical exam login to view 9 more bullets Evaluation Diagnosis from clinical exam and history Diagnosis confirmed with skin biopsy login to view 1 more bullet Differential Diagnosis Tinea corporis Secondary syphilis (especially if palm and soles involved) Tinea versicolor Drug eruption Guttate psoriasis Treatment Observation login to view 1 more bullet Natural sunlight Prognosis, Prevention, and Complications Prognosis login to view 2 more bullets Complications login to view 1 more bullet