<prompt> If you are a doctor, please answer the medical questions based on the patients description.My 10 month old daughter has a lump in her neck that is about the size of a bb. You can not see it but can feel it floating in the neck area. It does not seem to bother her even when touching it. Is this possibly a cyst or lymph node? Is it possibly something serious to be concerned about?  <response>: Hello! You havent mentioned where exactly on neck is the swelling if fever is there or not. If on either side of neck, more likely it is a lymph node. If in center in front of neck, it can be a congenital hypoglossal cyst. Clinical examination is necessary to know the diagnosis. Anyways, as u said the child is playful it doesnt cause pain on touching, need not go to ER immediately but should get examined once. Hope this information is useful to you. Thanks. Regards. 