This is a lymph gland. It is very common to find an enlarged gland in the neck of a young child especially after a bout of tonsillitis or a recent ear infection. What concerns me is that this gland is only on one side of the neck which is unusual and it seems to be fairly large from your description. I would be happier if you asked your paediatrician just to have look at this gland.
The information provided does not constitute a diagnosis of your condition. You should consult a medical practitioner or other appropriate health care professional for a physical exmanication, diagnosis and formal
advice. Health24 and the expert accept no responsibility or liability for any damage or personal harm you may suffer resulting from making use of this content.