A Child Who Has Psoriasis, Who Has Been Using a Moderate-Potency

A child who has psoriasis, who has been using a moderate-potency topical steroid on thick plaques on the extremities and a high-potency topical steroid on more severe plaques on the elbows and knees, continues to have worsening of plaques. In consultation with a dermatologist, which treatment will be added?

A) Anthralin ointment in high strength applied for 10 to 30 minutes daily
B) Calcipotriol cream applied liberally each day to the entire body
C) Oral steroids and methotrexate therapy until plaques resolve
D) Wideband ultraviolet therapy for 15 minutes twice daily