Rash under upper lip: By 'under upper lip', i assume you mean inner lip. This could be many things - cold sore, canker sore, reaction to a food or medicine you've come into contact with. Rashes are notoriously hard to diagnose without a picture, so make sure you check it out with your doctor!
Answered 3/1/2019
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A doctor has provided 1 answer
4 doctors weighed in across 2 answers
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