I have studied your case.
As per your history it looks swelling of soft tissue
which can be lipoma
or sebaceous cyst
I will advise to consult surgeon for clinical examination and if required proper investigation.
I will advise you to do MRI and Ultrasound
of the swelling.
Benign swelling giving rise to pain can be excised.
Hope this answers your query. If you have additional questions or follow up queries then please do not hesitate in writing to us. I will be happy to answer your queries.
Wishing you good health.