This 19-year-old young man presented for evaluation of a pruritic eruption over both elbows, occurring only in the summer months. He had noticed it last year, as well.

What condition accounts for this eruption?

A. Keratosis pilaris
B. Follicular eczema
C. Dermatitis herpetiformis
D. Summertime pityriasis
E. Polymorphous light eruption