The white granules inside the skin on the chest are considered to be whiteheads, pus rash and chestnut pimples. 1. Whiteheads: Excessive sebaceous gland secretion and follicular hyperkeratosis can lead to a mixture of sebum and keratin clogging pores, resulting in whiteheads, which are a type of acne, and are mainly manifested as pinhead-sized creamy-white pimples, and if squeezed by hand, can be discharged with a white sebum plug. 2. Prickly heat: Long-term heavy sweating will lead to cuticle impregnation and swelling, causing prickly heat, such as red prickly heat, if the treatment is not timely will develop into pustular prickly heat, the top of the pinpoint-sized potential pustules. 3. Chestnut papules: Chestnut papules may be related to heredity and damaged sweat ducts, and mainly appear as firm papules of creamy white or yellow pinhead to rice grain size, covered with relatively thin epidermis. There are white granules inside the skin of the chest, it should be treated symptomatically for the cause of the disease, usually pay attention to keep the skin clean and hygienic.