Hi.. Can understand your concern.. As per your complain a lump on the jaw can be due to a number of reasons and also depends upon the time duration for which they are present.. A lump can be due to an infected tooth leading to pus formation near the root tips leading to formation of a lump (Dental abscess) as pus accumulates in the soft tissues.. In this case treatment of the tooth either by root canal treatment or extraction can be done.. It can also be due to a blocked salivary gland duct leading to back flow of saliva into the gland and appears as a swelling just below the jawline as well as in the floor of the mouth.. It can also be due to inflamed lymph nodes due to infection in any part of the body and the lymph carries the infection along with it to the distant lymph nodes. It can also be cyst (jaw cyst, sebaceous cyst) or a tumor. In few long standing cases it can be a cancerous lump too.. I would suggest you to wait till the ultrasound report is given and need not to pain as the jaw lump can be most commonly due to non cancerous causes and can be nothing serious.. Treatment can be planned only after the diagnosis is confirmed.. Hope your query is solved.. If you find the answer helpful please write a positive review and click on find this answer helpful as a token of appreciation.. Thanks and regards.. Dr.Honey Nandwani Arora.