The document discusses the integumentary system, which includes the skin, hair, scalp, and nails. It describes how to assess various characteristics of the skin including color, moisture, temperature, texture, turgor, vascularity, and edema. Changes in these characteristics can provide information about a patient's health status and underlying conditions, such as oxygenation, circulation, nutrition, local tissue damage, fluid balance, and hydration. A thorough skin assessment requires inspection, palpation, and adequate lighting.