Hi.. Can understand your concern.. As per your complain a soft movable lump along lower jaw line that is movable is most commonly a swollen lymph node which can be due to infections originating from teeth,gums,salivary glands or any other nearby or distant structures of the body... A lump along the jawline can also be due to swelling in the salivary gland but a movable round lump is commonly a lymph node swelling due to infection.. In case if you have swollen gums around upper left molar there can be a chance that there is a deep seated infection in the gums or deeply infected tooth and both these conditions can lead to swollen lymph nodes.. I would suggest you to consult a dentist and get evaluated and get treated for the infection in the gums and in tooth (if infected) and as the infection will subside there are very much possible chances that the swelling in the lymph node will also subside.. Hope this information helps.. If you find the answer helpful kindly write a positive review and click on found this answer helpful as a token of appreciation.. Thanks and regards.. Dr.Honey Nandwani Arora.