A 25-year-old woman comes to you with a 1-week history of nonpruritic lesions on the upper right inner arm. Examination reveals three annular lesions with central scale. Treatment for tinea corporis is prescribed in the form of a topical antifungal agent. The patient returns 14 days later complaining of a generalized moderately pruritic eruption from the neck to the upper hips.
1. List the disorders that should be considered in this patient.
2. Is tinea corporis still part of the differential diagnosis, and if not, why not?
3. What are the primary lesions of pityriasis rosea?
4. What are the secondary lesions of pityriasis rosea?
5. What should you tell the patient about the prognosis for pityriasis rosea?
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