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The lump is a mucocele. Mucoceles occur when the ducts of the minor salivary glands in the lower lip get severed due to lip biting. This leads to an escape of saliva which pushes the overlying tissues upwards, causing a blister.
Superficial mucoceles generally resolve in a short time, but if you have had it for 4 weeks or more, some minor surgical care might be needed.
A simple excision of the blister would suffice, since it appears to be a superficial mucocele.
I would like you to read this excellent article on mucoceles:
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