Sun rash

74 y African American gentleman, h/o HTN, Hyperlipidemia, Prostate cancer and CRF, had a “cook out” over the weekend. He spent several hours in the sun that day and had a good time. Later in the evening, he developed red, painful, slightly pruritic rash over his hands and neck. The discomfort has been progressive over the past 48 hours. Denies any other systemic symptoms. His meds include Norvasc, Lisinopril, Doxazosin, Vytorin, Bicitra and Coumadin. No changes in his medications were made over the past several months. On exam, he has clearly demarcated, erythematous rash with fine blisters on his forearm.
What is the most likely diagnosis?

1. Sunburn- ANSWER
2. Polymorphous light eruption
3. Solar Urticaria
4. Drug induced photosensitivity
5. New onset cutaneous lupus.