A bulge inside the chin that is painful to press may be a result of lymphadenitis, or a sebaceous cyst combined with an infection, in addition to lymphoma and other etiologies. The lymph nodes of the human body are distributed in the jaw, if the neighboring tissues have infections, such as upper respiratory tract infections, pharyngitis, gingivitis, etc., it can also lead to lymphadenitis due to the spread of inflammation, which causes lymph node enlargement and pain symptoms. If there are sebaceous cysts in the jaw, co-infections may occur, and local enlargement and pain may also occur due to inflammation stimulating the local tissues, edema and inflammatory secretions. The enlargement of the area and the pressure pain, also consider whether there is lymphoma, although the painless progressive lymph node enlargement is the most common manifestation of lymphoma, but its enlargement compresses the local nerves, there will also be swelling and pain manifestation. If it is accompanied by various symptoms such as fatigue and fever, it may be related to the cause of the disease. Besides, there are many other causes that can lead to localized swelling and pressure pain, so it is recommended to consult doctor for diagnosis in time to avoid delaying the condition.