A 17-year-old boy presents with an intermittent asymptomatic rash on his cheeks that he says started 1 year earlier after a trip to Arizona over spring break. He is otherwise healthy, takes no medications, and has no other rashes.
Which of the following would you include in the differential?
A. Rosacea.
B. Atopic dermatitis.
C. Keratosis pilaris.
D. Polymorphous light eruption.
E. Cutaneous lupus erythematosus.
