Itchy bumps on the scalp may be caused by folliculitis, seborrheic dermatitis and other reasons. 1. Folliculitis: high temperature, excessive sweating, scratching, poor hygiene habits, systemic chronic diseases can lead to bacterial infection of the hair follicles, triggering folliculitis, which is mainly manifested in the appearance of red pimples or mounds of herpes on the surface of the skin, and may be accompanied by itching, pain and other symptoms. 2. Seborrheic dermatitis: seborrheic dermatitis may be related to heredity, sebum metabolism, etc., occurring in the scalp, face, chest and back and other seborrheic areas, manifested as erythematous rash on the surface of the skin, adhering to the scales or scabs, often accompanied by varying degrees of itching symptoms. Itchy scalp bumps may also have other causes, it is recommended to go to the hospital in a timely manner, improve the examination, clear causes, give targeted treatment.