Breast pimples are considered to be caused by the following conditions: a. Consider sebaceous gland inflammation, folliculitis, because it is an infection of pathogenic bacteria, the onset of the initial skin will appear follicular pustules, gradually will evolve into papules, the surrounding will be flushed red, will be recurrent, difficult to cure. Second, consider the nipple of the cuticle blockage caused by breast acne. The skin infection is considered, especially in summer when the human body sweats more and the chest is prone to bacterial growth by sweat erosion. The reason for this is that you should go to the hospital to have a checkup in order to discharge the possibility of breast disease.