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Milia are defined as:

  1. Pores with hair exiting from them

  2. Small hard white bump, sebum formed w/o pore

  3. Varying degrees of redness and inflammation

  4. Whiteheads

The correct answer is: Pores with hair exiting from them

Milia are defined as pores with keratin (a type of protein) getting trapped beneath the skin's surface, resulting in small, hard, white bumps. These bumps are often found on the face and commonly referred to as "milk spots." It is essential to differentiate milia from other skin conditions like whiteheads, which are different in terms of their characteristics and causes. Options B, C, and D do not accurately describe milia, making them incorrect choices.