Swollen lymph node in head? Any nurses here?

A few weeks ago I noticed that pressing or laying on one area on the back right side of my head causes pain. I have no headaches or dizziness or anything like that, but upon feeling around I feel that this area has a slightly bigger bump to it then the left side. It feels like my skull, just slightly raised. The only thing I found online was swollen lymph nodes in the head caused by infection, but I don’t want to over react. It’s level with the top of my ear but slightly behind it. I don’t have any other symptoms of infection. And I literally only feel it when it’s touched and after I mess with the area for a while. I’ve been under a lot of stress if that means anything. Seems to come and go.