What Is The Cause Of This Patient’s Psoriasis Flare?

A 42-year-old woman with psoriasis presented for evaluation of a new-onset rash of 1 to 2 weeks’ duration on her trunk and extremities. The lesions were associated with knee and back pain.

Her psoriasis had been well controlled on adalimumab (Humira) until this flare of rash. She had been switched from adalimumab to ustekinumab (Stelara) 3 days ago. She denied any infections, other changes in medication, or exposure history.




















What is the cause of this patient’s psoriasis flare?

A. Adalimumab failure
B. Occult bacterial infection
C. Physical trauma (Koebner phenomenon)
D. Occult viral infection
E. Some other etiology

To learn the answer, go to page 2

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