Flying with Allergies - To Disclose or Not to Disclose
It really depends on the online allergy policy. If they have a clear policy I will disclose my allergies. If they have no policy, I wait to board and ask the flight attendant what they do for allergies (more out of curiosity).
Until there is something clear and consistent it will always depend on what they say and how I feel. This all comes after almost being denied board twice from two different airlines.
For now I take all the precautions I can by wearing long sleeves, a hood, wiping down my space, and carrying my medications.