According to Dr. Bhanusali, there are several causes of the red, splotchy skin. "It's most commonly another name for polymorphic light eruption (PMLE), which is a reaction that people have to the sun itself," he said.
Although less common, he also has several other explanations for the rash. "Some people can have autoimmune conditions that can cause an inflammatory-like reaction like burning on the cheeks when in the sun," he said. "There are some patients who have allergies to ingredients in sunscreen as well."
Wondering if you can be affected? "It is more common in females with light skin or with a history of a sun rash, but can happen to anyone," Dr. Nussbaum said.