Hello and welcome to HealthcareMagic..
I thank you for posting your query here..
I being a surgeon, we encounter so many such cases day in and day out..
I read your question completely and have understood it well enough..
Though it's tough to say without seeing the swelling, but all I can say is
Lipoma is the most common swelling in such area..
Sometimes it can be a swelling arising from
nerve sheath or from muscle..
If you could, provide the picture or the
CT scan report I can say what exactly it is and how to go about .
Hope this helps you, in case you need further assistance, please contact me directly by searching my profile Dr Manjunath Metri.
Take care..