A 54-year-old man presents with the rash shown above, which he reports has been present for 2 weeks. He has applied moisturizer without improvement. He feels otherwise well with no fever or chills. He says that the rash feels irritated and occasionally itchy but is not swollen, painful, or warm. He states that the rash extends to his scrotum and is concerning to him.

What is the diagnosis?
A. Mycosis fungoides
B. Psoriasis
C. Tinea cruris
D. Cellulitis

This case is brought to you by VisualDx. Take the poll or respond below. Answer and explanation will be posted on Monday.