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 lump/area.  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.
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.