Hi.
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain Listerine does not cause blisters in mouth and the
white patch rather it can be due to side effect of the antibiotic combination that you are taking..
The antibiotics at times causes side effects in certain patients and blisters are one of the symptoms of the
allergic reaction of antibiotics and either reduction in dose or change in medication can relieve..
Although once you finish the antibiotic course the blisters will resolve..
The white patch on the upper lip can be a
fungal infection or due to dryness caused due to
dehydration causing chapped lip or a hypopigmented spot that can be due to a number of reasons for which you need to
consult a Dermatologist and get evaluated and treatment can be planned according to the diagnosis..
Hope this information helps..
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Thanks and regards..
Dr.Honey Nandwani Arora..