Thanks for placing your query here.
I can appreciate your concerns.
The most common lumps in neck are enlarged lymph
These can be caused by bacterial or viral infections, cancer , or other rare causes.
The procedure of removing the affected node & subjecting the tissue for further testing to confirm the cause is termed "excision biopsy
Therefore the excision biopsy is the logical first step.
Further treatment will depend upon the cause found.
Hope I have answered your query.
If you have any further questions I will be happy to help.
Wish her a good health.