Hello and Welcome to ‘Ask A Doctor’ service.
I have reviewed your query and here is my advice.
As per your complain it seems that symptoms of swelling of lips and
itchy blisters which subsided with anti-allergic like Benadryl but recurred can be due to
Allergic reaction causing Allergic
Angioedema of lips.
Yes, it can be due to any of the ingredients of the Pizza or it can be due to any other food or medication while other causes can be an allergic reaction to any skin cosmetic, soap, and lip balm.
I would suggest you consult an Emergency room and get evaluated and a clinical evaluation and investigations like blood tests for allergies like RAST TEST,
Patch test, Food Challenge test can help in ruling out the exact cause of the symptoms and treat accordingly.
As of now take anti-allergics like
Levocetirizine. Do cool compresses over the lips. You can be advised injectable steroids and antihistamines to reduce swelling.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. Honey Arora