Red bumps on the top of the head may be caused by seborrheic dermatitis, folliculitis, contact dermatitis, tinea capitis and other diseases. 1. Seborrheic dermatitis: a chronic inflammatory skin disease that occurs in seborrheic areas, common areas of occurrence are the head, face, chest and back, patients will have localized red bumps, flaking. 2. Folliculitis: red bumps on the top of the head may also be bacterial, fungal infection of the hair follicles caused by folliculitis, patients will also have localized pain, itching. 3. Contact dermatitis: due to the acceptance of certain easily sensitized or irritating items and the occurrence of perverse reactions, such as hair dye, often manifested in the contact area of erythema, papules, papules, blisters and other lesions, accompanied by itching, tingling and other symptoms. It can also lead to the situation of red bumps on the top of the head. 4. Tinea capitis: an infectious disease caused by fungal infection of the scalp and hair. Clinically, it is mainly manifested as red spots, pimples, scales, hair loss, accompanied by itching and other symptoms. It can also cause red bumps on the top of the head. Red bumps on the top of the head, it is recommended to go to the hospital, identify the cause and follow the doctor’s instructions for symptomatic treatment.