Challenge to diagnose unusual allergies
Some could have reactions to sunlight or when exercise is combined with certain food
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Calvin Yang
When Melissa (not her real name) excused herself from a university orientation game by saying she was allergic to sunlight, she did not receive much sympathy from her peers.
"Some joked that I was a vampire, but I wasn't amused," said the entrepreneur, now in her late 20s. "I would develop an uncomfortable rash on my neck and back if I am out in the sun for too long."
