Final answer:
Crusts (Secondary Skin Lesions) are dried, elevated areas that form on the skin. They can be caused by various skin conditions such as impetigo and acne.
Step-by-step explanation:
Crusts (Secondary Skin Lesions) are dried, elevated areas that form on the skin. They are formed when the top layer of the skin dries up after a sore or blister has burst. Examples of skin conditions that can lead to crusts include impetigo and acne.
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