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How to prevent milia
Apply sunscreen to protect yourself from the sun.
Milia are sometimes associated with the damage caused by long term exposure to the sun's uv rays. Whenever you'll be outside for an extended period of time, always use sunscreen with a rating of spf 30 or higher on the parts of your skin that are exposed to the sun.
Apply the sunscreen liberally to ensure it's protecting you. Wear clothing to guard against uv rays.