Hello and welcome to HCM,
It is too early to say that the lesion that you are having is due to cancer.
Since, the lesion is associated with pain, a history of trauma should be sought.
A couple of investigations are required to diagnose the lesion.
A X-ray of the elbow is needed.
The X-ray will show whether the lesion is arising from unerlying bone or soft tissue
If the lesion is arising from the soft tissue, a fine needle aspiration cytology (FNAC) is required.
In FNAC, a fine needle is inserted into the lesion, cells are aspirated, stained and examined under the microscope.
Examination under the microscope will determine the character of the lesion, whether it is benign or malignant.
It will also determine the origin of the lesion.
The further management will be guided by the result of the investigations.
Thanks and take care
Dr Shailja P Wahal