Yesterday a pecan sized lump appeared on the back lower right side of my head.  Its tender but not painful.  I had been having right upper abdomen pain and was recently diagnosed with erosive gastritis and ulcers.  Should I be concerned about this knot?  It is hard and immovable.  I also have been getting really bad headaches for the last few months.  They start midday and continue to get worse through out the rest of the day.
I, Dear,Good Morning, and Thanks for your query to my virtual Clinic At Chat Doctor. I studied your query in depth and understood your concerns. Causes for lumps at the back of head are as follows-a-Mostly they are boils as they are painless. AS its infective origin and could be treated, Don't worry of this lump. Headaches with them -are not associated with them in reality, but may be due to the high BP which you may have simultaneously.Don't worry of them, as they could be relieved with proper treatment. Hope above reply would help you to relieve of the issue you have. Welcome for any further query to ME and Chat Doctor. Write Good review for the benefit of my new patients. Click thanks ASAP after this. Have A Good Day. With Regards Chat Doctor.