<s>[INST] Hello please help my 8 year old son has a lump on the right side of his neck. I noticed it a few months ago. It almost reminds me of a broken vein. In the shape of a swooshy soft ball. I can kind of move it. Unlike a boil. I am very concerened. What can it be? About a year ago before the lump was noticed. His doctor thought she heard a heart murmur. After a test was done she ruled that out. I am going to try to get him seen asap. We have moved and I hope the new doctor will see him and find answers right away. Di you have any advice... please help. [/INST] Hi, dear. I have gone through your question. I can understand your concern. Your mat have some tumor or other lesion like tuberculosis or reactive lymph node.  So you should go fine needle aspiration cytology study once. It will give perfect diagnosis.  Then you should take treatment accordingly. Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using Chat Doctor. Wish you a very good health. </s>