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It could be Pityriasis rosea. It is an acute, self-limited, skin disease most likely to be due to a viral etiology. The rash may persist for two to three months. It resolves within this time. New lesions may occur during this period but should disappear spontaneously. If she has mild itching, medium-potency topical corticosteroids can be used. Oral acyclovir may be useful for shortening the course of pityriasis rosea. Phototherapy is an additional treatment option. She should see her doctor. When the diagnosis is in question, a skin biopsy can be performed.