The description of a lump behind the ear alone is not enough to make a clear diagnosis. The scope is relatively large and may be hemangioma, powdery tumor, or folliculitis, inflammatory, tumorigenic changes, etc. The former can be observed first or treated with topical timolol eye drops, if the effect is not good, laser treatment can be considered. If the former is not effective, laser treatment can be considered. 2, powdery tumor, also known as “sebaceous cyst”, manifested as repeated folliculitis, because of subcutaneous cystic changes, surgical treatment is required to cure. 3, folliculitis, occasional episodes of bacterial infection of the hair follicle, generally topical application of Bactrim, fusidic acid ointment, etc. can be. 4.Acute inflammatory lymph nodes, progressing fast and growing rapidly, can grow up within a few days visible to the naked eye, and can have pain and other symptoms. 5. Tumor-associated lymph nodes, which appear later in life but grow more slowly and only gradually over several months, are considered tumor-associated or chronic inflammatory. 4 and 5 need to be differentiated by combining results such as ultrasound and lymph node aspiration. Bumps behind the ear are relatively complex, and the above diseases vary widely from manifestation to etiology to treatment, so it is recommended to make a clear diagnosis before considering the next step.