Cervical "Lumps" (Cervical Lymphadenitis) ----------------------------------------- Abscessation of the lymph nodes immediately beneath the lower jaw, in the upper neck, usually results when coarse foods (such as hay) injure the lining of the mouth or when superficial wounds penetrate the skin over these lymph nodes. Bacterial invasion causes painful, swollen abscesses under the lower jaw. Sometimes these abscesses break open and exude a thick, creamy yellow-white pus. A veterinarian can perform a bacterial culture of the pus with antibiotic sensitivity testing to determine the appropriate antibiotic to use by injection. If the abscesses are large, surgical removal and aggressive antibiotic therapy may be recommended.