For many people, one of the joys of summer is spending time in the sun. But other people are extremely sensitive to sun. And some people can have an allergic reaction to the sun called polymorphous light eruption. This week on “Take Care,” Dr. Rosemarie Ingleton , professor of dermatology at Mount Sinai Hospital, discusses sun sensitivity and polymorphous light eruption. Ingleton is also an instructor at the Albert Einstein College of Medicine.