The appearance of several hard lumps on the left side of the neck, which are painful when pressed, may be related to skin diseases, enlarged lymph nodes and lymph node tuberculosis. 1. Skin diseases: For example, when sebaceous cysts appear in the neck, they are mostly formed by the accumulation of gland contents after the sebaceous gland ducts are blocked. Patients often present with round tumors on the skin with smooth surface and redness, swelling and pain when secondary infection occurs. 2. Enlarged lymph nodes: the left side of the neck is rich in lymph nodes. If the patient has thyroid disease or pharyngeal infection, such as tonsillitis, it can cause localized lymph node enlargement on the left side of the neck, resulting in localized lumps and pain when pressed. 3. Lymph node tuberculosis: mostly secondary to pulmonary tuberculosis or tuberculosis mycobacteria enter the cervical lymph nodes along with the bloodstream, leading to necrosis of the lymphatic tissue infection on the left side of the neck, which will result in lumps on the left side of the neck and pain when pressed. When there are several hard lumps on the left side of the neck and pain when pressed, it is recommended to consult a doctor in time, follow the doctor’s instructions for further examination, clarify the cause with the help of the doctor, and carry out targeted treatment or therapy.