Hi, happy to help you on your health concern on part of HCM!
In the present case of LOWER
LIP swelling or lump, if I were your consulting physician, I would just say you, 'nothing to worry!' Just avoid rubbing or hitting over it; and avoid hot/spicy foods; it might go itself!
As per your description, it is a benign harmless lesion like mucus retention
cyst or common papilloma like some fibroepithelial polyp.
In any case this could not be cancer...
Take caution not to get injured there as this might invite infection.
If you are still worried, please get examined by a surgeon or get some FNAC like cytological examination or revert back to us.
Hope you got your answer. Please feel free to write to us if any more queries.
Wishing you the best health!