Three cases with three different causes of lip and mouth swelling

First case is of a previously healthy 8 year old who presented with cough and a fever,
and who was initially treated with a macrolide antibiotic develops lip and mouth swelling
with blistering lesions leading to sloughing of the buccal mucosa. The presentation
was initially thought to be an allergy to the antibiotic, but as the case progressed,
a diagnosis of mycoplasma associated buccal mucositis was made. Second case is of
a previously healthy 4 year old who presented to the emergency room with pain and
swelling of the lips and tongue after drinking from a bottle labeled as containing
peach tea. After being treated repeatedly with epinephrine for presumed anaphylaxis
to a component of the drink, the case progressed with severe dysphagia and the development
of a white coating of the tongue which was diagnosed as the ingestion of a caustic
fluid. Third case is an 18 year old with recurrent disfiguring facial swelling. Initially
treated with epinephrine for allergic angioedema, the lack of response to epinephrine,
the persistence of the swelling over several days led to further work up that made
the diagnosis of hereditary angeoneurotic edema despite the absence of a family history.