Dry skin, also known as xerosis, occurs when the skin loses moisture and becomes rough, flaky, or itchy. This condition can be caused by various factors, including environmental conditions like cold weather, low humidity, and excessive sun exposure. Certain skin care products and bathing habits can also contribute to dryness. People with dry skin may experience tightness or irritation, especially after washing. It is important to keep the skin moisturized using creams or lotions that contain ingredients like glycerin or hyaluronic acid. Staying hydrated and avoiding hot showers can also help maintain skin moisture.