Painful diamond-shaped tongue lesion in elderly man

A 62-year-old white man with a past medical history of latent tuberculosis, vitiligo, and psoriasis presents for follow-up for treatment of psoriasis. The patient's psoriasis has proven refractory to numerous treatments over the years, so he began treatment with secukinumab, a monoclonal antibody against interleukin-17A. After 2 months of therapy, the patient reports new-onset tongue pain. Physical examination demonstrates an ...