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What is a crust in dermatological terms?

  1. A primary lesion

  2. A type of skin infection

  3. Secondary lesion that is a dried mass from an oozing sore

  4. A healing method for lesions

The correct answer is: Secondary lesion that is a dried mass from an oozing sore

A crust, also known as a scab, is a secondary lesion that forms over an oozing sore as it heals. It is a natural protective layer that helps prevent infection and further damage to the skin. A primary lesion refers to the initial appearance of a skin condition, while a type of skin infection is not a specific term used in dermatology. "Healing method" is vague and not commonly used in dermatology. Therefore, the correct answer is C.