What is the rarest allergy in the world?

Online Answer
World's most rare and uncommon allergies
  • Water. Aquagenic urticaria is a rare condition that causes itchy and painful hives to break out whenever the sufferer comes into contact with water. ...
  • Exercise. Although regular exercise is advocated as part of a healthy regime, there are a few people who have good reason not to hit the gym. ...
  • Money. ...
  • Human touch. ...
  • Sunlight.
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