Hello Dear and thanks for the query
The lump on the neck can be due to enlarged lymph
nodes or due to cold abscess
of the neck. To get to a final diagnosis you either go for sonography
of the neck or needle aspiration test (FNAC) of the lump. As you have no symptoms, it is not an emergency and you can do it whenever you want to do. Consult your treating doctor, he can guide you better that which investigation is best for you. Clinical examination of the lump is very important.
Hope you got your answer.