Swollen lymph nodes behind the ear are very common and are a type of mass behind the ear. Swollen lymph nodes behind the ear can occur at any age and can be seen in a variety of diseases, but are more commonly caused by a cold or an inflammatory infection, most often produced by Staphylococcus aureus or hemolytic streptococcal infection. Generally inflammatory lymph node enlargement is clinically associated with gingivitis, otitis media, mumps, suppurative parotitis, and acute tonsillitis. If it is tumorigenic, it can be combined, and the lymph nodes may have a hard texture and irregular surface, and this kind of pathological examination is mainly done. There is also a kind of lymph node tuberculosis, which mostly originates from the deep neck, and swollen lymph nodes such as the upper neck are more common. Therefore, swelling of the lymph nodes behind the ear is more common as an inflammatory disease.