Possible causes of pimples growing on chest like big pustules include skin boils, folliculitis, acne, etc. It is necessary to take treatment according to the specific disease after clear diagnosis, which usually can be oral and/or topical medication, surgery, photoelectric treatment and so on. 1. Skin boils: pimples on the chest like big pustules may belong to skin boils, the treatment may choose to release the pus, and then local use of iodophor to disinfect, at the same time can be used with erythromycin ointment topical. 2. Folliculitis: A pimple on the chest like a big pustule may belong to folliculitis, usually due to the hair follicle infected with an inflammatory reaction. Treatment can choose to use fusidic acid cream, erythromycin ointment for external use, at the same time to do a good job of local hygiene, often change clothes, avoid local scratching. 3. Acne: It can be caused by endocrine disorders, Propionibacterium acnes infection, etc., which may cause pimples on the chest to grow like big pustules. The treatment can choose topical fusidic acid ointment, oral retinoic acid, red and blue light and other means of treatment. There are many reasons why pimples on the chest are like big pustules, and it is recommended to go to the hospital in time to improve the examination after the symptoms appear, and take standardized treatment according to the doctor’s instructions, not to be taken lightly. The above drugs need to be used under the guidance of the doctor, so as not to lead to adverse consequences.