Doctors can identify many skin disorders simply by looking at the skin. A full skin examination includes examination of the scalp, nails, and mucous membranes. Sometimes the doctor uses a hand-held lens or a dermatoscope (which includes a magnifying lens and a built-in light) to better see the areas of concern.
Revealing characteristics include size, shape, color, and location of the abnormality as well as the presence or absence of other symptoms or signs. To check the distribution of a skin problem, the doctor often asks the person to undress completely, even though the person may have noticed an abnormality on only a small area of skin.
If simply looking at the skin does not provide the doctor with a diagnosis, many tests to identify skin disorders are available.
(See also Structure and Function of the Skin.)

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