Pustular red bumps on the head may be caused by folliculitis, tinea capitis, contact dermatitis and other causes. 1. Folliculitis: folliculitis is mainly caused by bacterial infection, local pore blockage and inflammation, the skin will appear red bumps, pain, pus head and other phenomena. 2. Tinea capitis: the disease is caused by fungal infection of the scalp and hair, can appear red spots, pimples, pustules, scales, hair loss, itching and other symptoms. 3. contact dermatitis: due to scalp contact with certain sensitizing or irritating substances, resulting in the occurrence of perverse reactions, clinically mainly manifested as erythema, pimples, blisters, itching and other symptoms, if scratching the lesions secondary infection, there will also be pus red bumps on the scalp. It is recommended to go to the hospital for examination, the doctor will be based on clinical symptoms to give the appropriate judgment, identify the cause of the disease and timely symptomatic treatment.