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This is Dr. David. I am reviewing your question now and will be with you momentarily.
it sounds like you have an upper lip infection, it could be a bacterial infection if you had pus infected fluid come out of it
you really should see a GP doctor in the UK and get on a course of antibiotic pills to help decrease this pain and infection.
you can use cold compresses on the area to help decrease pain for now
you can take paracetamol pills for pain
do you have a GP doctor you can see?
or you can go to the hospital A&E department without an appointment and most likely they will give you a prescription for an antibiotic
you don't want this potential infection to spread and get worse.
let me know if you have questions.