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Cystic acne is the worst form of acne that a person can experience. It is more serious and damaging compared to other forms of acne such as pimples or whiteheads. This is due to the fact that the infection penetrates deeply within the skin layers and can cause very large and painful nodules. Another name for this is acne vulgaris. Acne cysts or acne nodules, are formed when sebum cannot properly outflow to the surface of the skin and causes lesions to the cells lining the walls of the sebum canals. Once this occurs, the pores become blocked and inflamed due to the immune system trying to fight off the infection. When there are a lot of bacteria, the immune system reacts more powerfully; this often results in a larger size pimple, better known as an acne cyst.