Oily skin is caused by overactivity of the sebaceous glands. This type of skin tends to be thick, with large pores, and acne may be a problem. Dry skin is caused by underactivity of the sebaceous glands, by environmental conditions, or by the normal aging process. The skin is thinner, has smaller pores, and is easily irritated. Whatever your skin type, you probably should wash your face both morning and evening.
Normal skin requires a mild cleansing bar.
In the drier winter months, use a superfatted soap. Oily skin may require more than two washings. Dry skin does best with a superfatted soap. Many specialty cleansers other than soap are available commercially, but these products do not have any advantage over soap and water. Soap and water washing does not promote the development of wrinkles.