Welcome to Health care magic.
1. The history provided by you suggest me - the lump / lesion at the underside of the jaw - could be sailoadenitis (
salivary gland pathology - dilatation of the duct due to infection and inflammation).
2.The one below it could be the
lymph nodal enlargement ( lymph nodal enlargement is seen in infection or inflammation localised / systemic, here it look like localised.
3.An
ultrasound examination will help to assess the nature of the lumps its source and their extension.
4.After that if required an FNAC - fine needle aspiration cytology would help to know the type of cells.
5.Depending on the findings the treatment will be given.
As a home remedy do not scratch, press the lesion - it will daly healing process, maintain local hygiene. Good luck.
Hope it helps you. Wish you a good health.
Anything to ask ? do not hesitate. Thank you.