22mth son has a large solid fixed lump on right side of neck below his ear. looks like half a golf ball when he turns his head. doesn't seem poorly?

See Your Doctor Now: A neck mass in a young child can have a few causes. More information is needed such as duration, consistency, tenderness, & more. Most commonly cervical lymph nodes can enlarge due to infections however be aware that congenital anomalies do occur. This mass will require physical inspection and correlation with a detailed medical history. See your doctor now for prompt and accurate diagnosis.

Neck swelling: This could be a cyst,a lymph node or another structure. It is large enough, that it requires evaluation by a physician. Sometimes an Ultrasound may help sort it out. All the best.