Common causes of bumps on the head of adolescent boys include moles, folliculitis and other diseases. 1. nevus: bumps on the head of adolescent boys may be benign skin growths such as intradermal nevus and nevus sebaceous, which may be related to genetic factors and developmental defects. 2. Folliculitis: related to bacterial infection, common causative organisms include Staphylococcus aureus, Staphylococcus epidermidis, etc. The skin lesions manifest as red follicular papules and pustules, surrounded by a red halo and other symptoms. It is recommended that patients go to the dermatology department of regular hospitals, combined with relevant examinations, clear diagnosis and active treatment to avoid delay.