I am very concerned about my 16 year old dog. Recently, she stopped eating her usual food and started drinking a lot of water. She also had diarrhoea. The diarrhoea has stopped, and her eating has resumed. Though her appetite is not as great as it was a month ago, she's eating when she wants, which is the main thing. She's also gone back to drinking normal amounts of water. Something I noticed today was what appears to be 2 lumps on either side of her face. One side is larger. When I touch it, she seems to be in some sort of discomfort. I'll attach photos, hoping someone could help me figure out what they could be, please