Well, let me first assure you that it cannot be lip cancer. In case of lip cancer, the bump wouldnt go away by itself, it would remain constantly and get bigger slowly. So this is not a cancer.
Since HSV is ruled out, this is most likely a mucocele.
Mucocels are harmless swellings of salivary glands inside the lips, they can swell up and go down.
They are not of much concern and usually no treatment is required.
If they are big they may require excision, which is a simple office procedure.
For now, apply warm compresses when the bump appears.
Take care - there is no need to worry about this - you can wait safely for your doctors appointment.
Dont worry, this can be treated easily - show your doctor in time- be safe.
Take care - wish you good health and a quick recovery.
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