Painful bumps on the neck may be sebaceous cysts secondary infection, thyroid cysts or lymphadenitis. 1. Sebaceous cysts secondary infection: sebaceous cysts are formed when sebaceous ducts in the skin are blocked, leading to sebum accumulation and cyst formation. Generally, patients do not have conscious symptoms, but sebaceous cysts are more prone to infection, and after pus breaks out, it will cause pain. 2. Thyroid cysts: thyroid cysts are benign cystic lesions in the thyroid gland, the specific cause of which is still unclear, thyroid disease and long-term iodine deficiency are the main triggers, and the symptoms are usually manifested as round, smooth lumps in the neck, accompanied by dyspnea and mild neck pain. 3. Lymphadenitis: Lymphadenitis is due to the invasion of germs from the skin or infected foci into the lymph nodes, resulting in inflammation of the lymph nodes, the main clinical manifestation is that the lymph nodes appear enlarged, accompanied by obvious pain. Because of the causes of pain in the neck lumps are more reasons, when the symptoms of discomfort, it is recommended to go to the hospital in time for examination and diagnosis, to clarify the cause of the disease to take targeted treatment, to avoid delaying the aggravation of the symptoms, resulting in a serious impact.