Allergens could trigger an allergic vasculitis. That would explain the symptoms.
He has no history of allergies or asthma. Most importantly, none of his symptoms remotely resemble an allergic reaction.
[SEP] He has no history of allergies or asthma. Most importantly, none of his symptoms remotely resemble an allergic reaction. [SEP] Allergens could trigger an allergic vasculitis. That would explain the symptoms.