welcome to healthcare magic. You have mentioned about lymph
node enlargement under the jaw and on your neck. let me tell you that lymph nodes get enlarged in response to any kind of infection. They return to normal size once the infection is controlled. But sometimes if the infection is chronic or long standing, they remain enlarged for a long time. If they are not increasing in size and are not painful, there is nothing to worry. But as a precautionary measure, please get a complete oral examination done to check whether you have a dental infection. you must also go for a complete ENT check up because any kind of infection in these regions leads to enlargement of lymph nodes. Take care !