For some chlorine is definitely a trigger. For many the cold is. I would like to do the work up with an allergist. Just so much work and committment and more appointments. But I have to try something to see if I can identify it. I wasn't functional as a person in the amount of pain and disfigurement so I gave into Dupixent which is saving my life but I don't want to stop there. I want to get to the bottom of it. So frustrating as it's different things for different people.