Im a 20 year old guy never hit my head and 6 days ago I started having headaches, and yesterday noticed a ovalish bump on the back of my head that I don't think was there before. It is fixed, the size of a small bean, and feels like it could be bone it's hard I Google and if it is my occipital lymph node like I think it is I most likely have cancer.

I went to the ER and the NP said it could be lymph node and did a CT scan w/o contrast. She said she didn't see anything, believes it will go away and sent me home with a generalized headache diagnosis. I have had blood work done a month ago such as CBC and other things which came out great.

Now with the idea of possibly having lymphoma I'm scared and don't know what to do...