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This is Dr. David
yes, you can take lysine ammino acid supplement pills.
is the tiny bump on your lip painful? it sounds like you are worried about oral herpes cold sores in your mouth. these tend to be very painful.
the tiny bump could be from a blocked salivary gland.
it would be unlikely for oral herpes virus to manifest right after you finished famciclovir.
can you upload a clear jpg photo of this tiny bump on your lip? is it big enough to take a photo of?