My son has a lump on his neck wot could it be the doctors said it nout could it be cancer as some one i know had one and it turned out to be cancer.?

Depends: His age and health? Most lumps in the neck of children are the result of a throat infection. Once enlarged they can persist for a long time. Adults with lumps are different than children. In adults, smoking, & other factors increase the risk of cancers. If the lump is rubbery & growing, then it should be rechecked. If necessary, further tests can be done to determine its cause.

Lymph node: Thousands of lymph node located in the body help remove germs in the serum before it returns to the circulation. There are many in the neck & head. At rest these are often 1/4 " in diameter and may grow to marble sized when reacting to a stimulus. Bug bites, or viral infections can increase their size. It can catch cancer cells or develop it, but rarely.Kids age & lump behavior determine risk.