Thanks for choosing health care magic for posting your query.
I have gone through your question in detail.
The two facts do not seem to be related though. The lump could be anything from a simple lipoma
to a simple fibroma
and there doesn't seem anything to worry about.
As far as your stiff neck
and stiff back are concerned, you should get a MRI
of the whole spine done. That will give you a good idea about the nature of problem. Most probably it could be simple degenerative disease and will recover with rest and proper physiotherapy
Hope I am able to answer your concerns.
If you have any further query, I would be glad to help you.
In future if you wish to contact me directly, you can use the below mentioned link:
Wish you good health,
Dr. Srikanth Reddy M.D.