Hi there. My 22 month old son has a lump on the left side of his head at the base of the skull. The lump is slightly movable and can only be appreciated when his head is in certain positions. Can t tell if it hurts or not as he can t tell me
These are lymph nodes which you are able to palpate. Lymph nodes are present in whole body. Lymhoidb tissue expansion is present in child Chat Doctor.  There is a specific cutoff for size of these swellings as per there location in body. If it is more than 1\u00a0cm size in neck area then it may be secondary to some problem. If it is large or rapidly increasing in size or becomes fixed to overlying skin or overlying skin becomes red, then consult pediatrician