So my 4 year old dog underwent a fine needle biopsy today because of his swollen lymph nodes under his jaw. During the procedure, he had a bleeding in his mouth which went away immediately. Vet thinks that its his salivary glanf thats inflamed and not the lymph nodes.Later this evening, i noticed that the skin under his jaw became saggy, and it feels like there is fluid inside. What could this be? I am so worried that the lymph nodes or salivary gland bled inside and is leaking under his jaw.