<s>[INST] I found a lump on the back of my neck starts below my hair line on the right side of my spine and continues down most of my neck its large and about the size of half a tennis ball. I'm a 22 year old female and have been having alot of other health problems the doctors have not been able to connect. The lump is new not pain ful but I am having some shoulder pain? Any ideas? [/INST] Thank you for asking Healthcare majic. My name is Dr Ehsan Ullah & I have gone through your query.you have mentioned about the Lump in the Nape of the neck.&along with that you have mentioned about shoulder painThere are Various Causes for this Lumpdepending upon Its Features you have mentioned the Size of it as Tennis Ball and its Not Painful.Most probably it's Lipoma which is a benign (Non dangerous) swelling/collection of the Fats Other causes can beenlarged occipital lymph node but those are usually a little higher than the position you mentionedCysts whatever the nature of this lesion isAll suspicious lumps require examination by the Physician with clinical examnationand you may need to have some Lab work up along with Radiological evaluation (Ultrasonography / X-Ray)For Shoulder pain , you Can use Over the counter available medications like Tab Tylenol.Hope this may help you. Let me know if anything not clear. Thanks. </s>