<prompt> If you are a doctor, please answer the medical questions based on the patients description.i have a lump where my neck connects to the base of my skull on my right rear side of my head. It is not consistently present - i have noticed the last few months it is prominent when I get my period. It is painful and I have a continual headache that seems to eminate from the lumparea. If I press my chin to my chest and stretch my neck it is very stiff and painful in that area. If i apply pressure to it the pain increases.  <response>: Welcome to Chat Doctor .1. The location you have mentioned - general pathologies could be submandibular gland enlarged salivary gland obstruction can cause lumpy area lymph nodes are always one of the cause ectopic thyroid.2. In this case if you are my patient I would examine and send for an ultrasound scan to find out the origin consistency involvement of adjacent structures.3. Only after that one can come to a conclusion.4. Hope it helps you. Anything to ask ? Do not hesitate. Thank you. 