Small bags on the scalp and itchy may be due to scalp folliculitis, seborrheic dermatitis or scalp eczema and other causes. 1. Scalp folliculitis: a purulent inflammation caused by bacterial infection of the scalp follicles, usually leading to the appearance of bright red or crimson follicular inflammatory papules on the scalp of the patient, conscious of itching and other manifestations. 2. Seborrheic dermatitis: a chronic inflammatory disease of the skin caused by excessive sebum overflow, usually associated with bacterial infection, excessive scratching, environmental factors and other factors, may also lead to the patient to appear on the scalp with a small packet of itchy symptoms. 3. Scalp eczema: patients with scalp eczema due to allergies and other reasons, usually on the scalp will appear red spots, pimples, edema, and accompanied by obvious itching, scratching will have oozing. If the patient has a small bag on the scalp is also itchy, should be timely medical examination and treatment, daily life, pay attention to scalp hygiene, keep the scalp dry and clean, avoid scratching, do not self-medication.