Welcome to JustAnswer Health...and thank you for your question. I am a verified Expert and am delighted to help you today. That's not a likely place for a swollen lymph node but is a common place for a fatty tumor ( lipoma) Because it has grown it's wise to have it looked at by your Doctor to make sure it isn't something more sinister such as a cancerous tumor.
Fatty tumors are harmless.... and that is probably what it is... but do get it looked at for your peace of mind.
A cyst would be painful, swollen, tender and eventually produce drainage.. I don't think that is what it is based upon your description.
that is a lipoma
So is that one.. but it's larger
Yes.. It is most likely a lipoma
here is a diagram of lymph nodes.. is yours in one of these places?
It can vary from soft sqhishy pea to small hard pea
actually shaped more like a kidney bean
It would be very uncommon to have one lymph node enlarged on that area of your back
and if it were a lymph node it would be tender and sore if enlarged
If it's on your ribs that makes it even more likely that it is just a fatty tumor
thank you! you are very welcome:-))