Hi..
Can understand your concern..
As per your complain a bump on the lip with white stuff in it can be due to a few cases which may or may not be
herpes..
A bump on the lip can be due to bacterial infection caused due to using of infected lip products or other things for that matter causing formation of pus filled
blister..
It can be due to viral infection causing
cold sores (Herpes) but it is commonly in clusters but a single lesion can also be there..
It can also occur due to excessive sun exposure leading to formation of sun blister..
It can also occur due to inflammation of minor
salivary gland present over the lips causing swelling as well as trauma to the the minor salivary glands can lead to formation of
mucocele..
As you told that now it has disappeared so now you need not to worry and just maintain a good hygiene and do not share lip products with others..
Always apply SPF 15 containing lip balms over the lips while getting into sun..
Avoid lip biting and lip sucking habit as it can injure the salivary glands and minor blood vessels..
In case of relapse you should
consult a dermatologist..
Hope this information helps..
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Thanks and regards..
Dr.Honey Nandwani Arora..