<s>[INST] Hi, may I answer your health queries right now ?  Please type your query here...I have been diagnosed with large cell carcanoma in my lungs which has metastised to my lymph nodes, andsternum, and the top of both kidneys,  I am presently undergoing treatment byintravenous vitamin c  leatril,, ozone therapy and perftec   all of which give a larger supply of oxygen to the blood .I have recently noticed a bump about the size of a pea on the top of my head. It is not sore only very hard and when I looked on google  to see the lymph node areas, that area is not show to have a lymph node.  Do you have any ideas of what this can me? [/INST] Hi, Thanks for writing in. Since there is a large cell carcinoma of lung with involvement of lymph nodes and sternum, it is important to evaluate the pea sized swelling on the top of your head in detail. It is true that the skin on top of the head does not have lymph nodes and what you have read is right. However, we need to consider if there is cancer spread to the scalp or skull else should there be any infection which is appearing like a pea sized swelling. A consultation with your oncologist is suggested with investigation like CT scan or MRI scan brain if required to help know the probable cause of swelling. Please do not worry </s>