Pustules inside pimples on the body may be caused by impetigo, acne, folliculitis and other factors. 1. Impetigo: mainly caused by Staphylococcus aureus infection, mainly seen in children. It manifests as pustules and may be accompanied by fever and swollen lymph nodes. 2. Acne: may be related to genetic factors, sebaceous gland secretion, etc. It can be manifested as pustular lesions, which may be accompanied by pain, redness and swelling. 3. Folliculitis: an infectious disease of the hair follicles mainly caused by bacteria, single hair follicles infected with fusion can form large pustules, which can be accompanied by itching and pain. If you have pimples with pustules on your body, it is recommended to go to the dermatology department of the hospital for appropriate examination and treatment as prescribed by the doctor.