If a girl has acne on her chest, it may be acne on this part, especially acne vulgaris, which may be mainly related to staying up late, eating barbecue, mala Tang or other spicy food. If these bad eating patterns may cause local inflammatory reaction of patients, if you eat sweets frequently, it may also induce acne in this part. The acne in this part may also be infected with molluscum contagiosum, which may be caused by the proliferation after being infected with molluscum virus. In addition, it may be that this part is infected with fungi, especially Malassezia folliculitis.