 [ Symptoms ] my daughter gets blisters in her throat every few weeks some are full of pus turning into bronchitis what causes  she has been to ents and mds both just treating with massive antibiotics her blood was allergy tested and none found could it be food allergies she had severe mono 8 years ago and her immune system seems to be compromised more than most otherwise a healthy active 25 year old [ Disease ] obviously without the ability to see these blisters first hand i cannot offer you a patient specific answer but many people who see blister like growths on the pharynx throat are really seeing ectopic lymph tissue often referred to as cobblestones in the medical world this area is rich in lymph tissue cobblestoning can be found in a variety of medical conditions   basically anything that causes inflammation allergies even if no allergies were identified and recurrent viral infections irriation from post nasal drainage etc all can cause these cobblestone like effects unless a bacterial infections is diagnosed by a culture or rapid strep test antibiotics especially massive antibitoics tend to have no curative effects blisters filled with pus would not be common for cobblestones if she also gets bronchitis at the same time it may not be related to this throat finding at all most cases of bronchitis are viral although a specific reason has not be determined by her medical providers it would be wise to keep looking