This papulosquamous eruption is most common in young adults. A single oval patch is generally noted several days before a more generalized, fawn-colored rash erupts. This rash is most prevalent on the trunk, and the proximal upper and lower extremities. The rash spontaneously disappears over 5 to 6 weeks. The diagnosis is:
A. pityriasis rosea.
B. tinea corporis
C. psoriasis.
D. atopic dermatitis.
E. sporotrichosis
Answer: A
This is the classic presentation of pityriasis rosea. Remember that the differential diagnosis includes secondary syphilis, so if a positive sexual history - consider ordering a VDRL/RPR. The "herald" patch which is described is pathognomonic for pityriasis.
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