A hard lump in the neck under the chin can be referred to the general surgery department or to the ENT department, depending on the symptoms. If there is a swelling in the thyroid gland or superficial surface of the neck, it is usually a thyroid disease, swelling and inflammation of the lymph nodes in the neck, which are all under the scope of general surgery. If there is a hard lump in the neck and it is difficult to swallow, or if there is pain or obstruction when swallowing, it may be a swelling or polyp in the throat, so you have to consult the ENT department to see the swelling clearly through laryngoscopy.