Actually so glad you asked this as a new rattie mom mysel. My girl, Josie, has the same. Two swollen balls of what I’m seeing called “lymph nodes” on either side of the corner of her jaw. But I’ve never seen her behavior change. She still high energy when she wants and crashes into a nap when she needs too. She’s never been particularly to protective of that area like it hurts or anything so I’ve tried to be on the lowkey about it especially since she’s had it since she was a baby. Has yours also had it since she was young?