The back of the head protrudes a bag a little itchy, this situation depends on whether the skin rash or eczema is the cause, if so, you can apply skin cream or urea ointment to reduce inflammation and rash. If not, it is a subcutaneous cause, possibly caused by localized posterior occipital lymph nodes. The cause is most likely to be inflammation around the area, such as eczema on the scalp or inflammatory reactions in the external ear canal, or it may be an inflammatory reaction in the oropharynx or nasopharynx that will eventually cause the lymph nodes to proliferate. At this time, it may be necessary to apply oral antibiotics to eliminate the inflammatory reaction, pay attention to more rest in daily life, avoid excessive head bowing, and reduce local irritation. If the symptoms are relieved in 3-5 days, the antibiotics can be discontinued. If the symptoms are not relieved, it is recommended that a hospital visit be made to perform a cervical-occipital examination to rule out the necessary abnormal diseases. For example, tumors in the nasopharynx or cholesteatoma in the external auditory canal, etc. These conditions may occur.