Is it ok to have multiple shotty lymph nodes under 2cm throughout head and neck and have one which is 2.5 cm very soft and moveable and fluctuates siz?

Needs follow up: Asymptomatic but persistent neck nodes can be due to chronic sinus or nasal issues, allergies, lymphadenopathy disorders such as castlemans disease, etc. And also sometimes due to lymphomas which are low grade in nature. If there is no satisfactory cause identified over time then evaluation by an infectitous disease or hematology specialist may be of use.

Monitoring Centers: Lymphatic system absorbs/carries things too big to go into the arteries/veins like bacteria eaten by white cells and digested food. Lymph nodes "taste" the lymph for anything bad like bacteria/viruses/cancers, etc. When it detects a problem, it alerts the immune system and your body reacts. They enlarge in response to the inflammation they create when they react. They shrink when all is well.