My two year old has a swollen lymph node or gland on the right side of the neck. its moveable and been there for some time. ?

Lymph node: For the moment I would keep an eye on it.As long as it remains isolated, it poses no problem. As you yourself suggests it's been there for some time causing no problem

Usually is benign: Lymph nodes are located throughout the body & generally noticeable in exposed areas like the neck. They are usually pea sized at rest and enlarged when stimulated by bug bites,dermatitis, drainage or infection. They rarely can become damaged by infection & grow to golf ball size &need drainage or removal. Most enlarge and later shrink back down within a 3 wk cycle unless chronically stimulated