Milia are small, white bumps that form when keratin becomes trapped beneath the skin’s surface. They are common, harmless, and often appear around the eyes, cheeks, and forehead—but they don’t clear easily on their own. What Causes Milia? Milia form when dead skin cells don’t shed properly and become trapped under the skin. Common causes include: Buildup of dead skin cells Heavy or pore-clogging skincare products Sun damage and thickened skin Improper exfoliation or lack of e