Blackheads are a kind of open acne, mostly due to the blockage of follicle mouth keratinization and poor excretion. The white stuff squeezed out from blackheads are mainly lipid plugs, mite secretions, and some blackheads are squeezed out with white pus and other substances. 1. lipid plugs: the skin follicles are blocked and the lipids inside the follicles are oxidized, which manifests as blackheads. 3, pus: skin hyperkeratosis or sebum metabolism disorders, can lead to inflammation of the follicle sebaceous glands in the formation of blackheads at the same time, then squeeze out the white things may be pus; 4, shedding keratinocytes: blackheads may be skin metabolism, keratinocyte shedding blockage can not be discharged, squeeze out the white things may be shed keratinocytes. Daily it is not recommended to directly squeeze blackheads with your hands, for the extruded white material should not be directly contacted with your hands, if necessary, you can follow medical advice to use antibiotic ointment to avoid infection. The blackheads caused by the sebaceous glands secretion, and often eat irritating food, improper use of cosmetics have a certain relationship. It is recommended that patients should eat a light diet, less cake, hot pot and other foods, and pay attention to reduce the use of cosmetics and do a good job of cleaning.