The phenomenon of a moving pimple at the root of the left side of the neck may be caused by lymph node hyperplasia, sebaceous cysts or lipomas and other factors. 1. Lymph node hyperplasia: due to the inflammatory reaction of the lymph nodes in the left side of the neck due to pathogen infection, it can cause lymph node hyperplasia, which is manifested as painless or lumpy changes with pain; 2. Sebaceous cysts: due to the sebaceous gland ducts in the skin of the body blocked sebaceous stagnation, and the gradual formation of retention cysts, so it can be manifested in the left side of the neck root there is a moving pimple phenomenon, accompanied by redness, swelling, fluctuating sensation, and pain and other symptoms. 3. Lipoma: a common benign soft tissue tumor, mainly composed of mature fat cells, and its tumor body is soft and elastic, and it will move slightly when pushed by fingers. If the above symptoms occur, it is recommended that patients enter the hospital in time to find out the cause of the disease and actively cooperate with doctors for treatment.