Hi, I had gone through your question and understand your concerns. Best option is do a excision biopsy of lump , and see what comes on histopatholgy , most of times it comes out to be a benign nonspecific lymphadenitis. You need not to worry but discuss about need of excision biopsy with your doctor. Hope this answers your question. If you have additional questions then please do not hesitate in writing to us. Wishing your son good health. •     DISCLAIMER: - All the information provided here is for information purpose only , it is not a substitute for the advice of a physician after physical examination , it is not intended to replace your relationship with your doctor. This information in no way establishes a doctor-patient relationship. Before acting anything based on this information do consult your doctor. I recommend that online users seek the advice of a physician who can perform an in-person physical examination