Hard lumps on the neck are usually enlarged lymph nodes, thyroid cancer, dermatofibroma, nodular goiter and so on. 1. Enlarged lymph nodes: If there are inflammatory factors that stimulate the lymph nodes, then enlargement of lymph nodes can occur and a hard lump can appear on the neck. 2. Thyroid cancer: If various factors lead to the abnormal proliferation of thyroid cells, then the phenomenon of enlarged lumps can appear. 3. Dermatofibroma: Because many factors stimulate the skin, resulting in the proliferation of skin fibrous tissue, a hard lump can appear after protruding out of the skin. 4. nodular goiter: due to iodine deficiency, heredity and other factors lead to a large number of thyroid gland hyperplasia, at this time there can be the phenomenon of long neck lumps. Finally, please go to the hospital in time to check the phenomenon of long hard lumps on the neck and follow the doctor’s instructions for treatment.