Lumps on the head may be caused by folliculitis, lipoma, boils and so on. 1. Folliculitis: Folliculitis is generally a purulent inflammation of hair follicles caused by bacterial infection, usually caused by poor hygiene habits and environmental factors, etc., and the patient may experience localized redness, swelling, fever and other symptoms. 2. Lipoma: Lipoma generally refers to any benign tumors formed in fatty areas, usually caused by poor living habits, dietary factors, etc. Patients may have painless tumors, hard lumps when pressed, and so on. 3. Boils and carbuncles: boils and carbuncles generally refer to inflammation caused by infection of the soft tissues of the skin, usually caused by bacterial infection, poor personal hygiene and other reasons, patients may experience redness, swelling, pain, elevated skin temperature and other symptoms. Lumps on the head are also seen in other causes, patients should go to the hospital under the guidance of doctors to identify the cause of treatment.