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What Is a Milium Cyst? A milium cyst is little, white bump that normally appears on the nose and cheeks. These cysts are typically discovered in groups, and in these cases are called milia. The cysts take place when keratin ends up being trapped beneath the surface of the skin. Keratin is a strong protein that is generally discovered in skin tissues, hair, and nail cells.
While they look a little like whiteheads, they are quite different. Milia are small keratin filled cysts and they can appear under your eyes, on the chin, on your nose, on the cheeks or even on the roof of your mouth. Image: Shutterstock.