Hello there. I can understand your concern. What i do not understand however is how are you having fever only in the neck. Do you mean there is a local rise in temperature near the swelling? It may not be anything serious. It could be a lymph node enlargement or some other swelling which needs to be examined to comment. My advise would be that you consult a general surgeon in person for further evaluation and management. Best regards, Dr. Anil kumar jain. Bangalore.

It is difficult to advise without examining, hence it is better to see a doctor who can examine you and advise accordingly.