Wood’s lamp in the clinical application of filtered ultraviolet light to examine a means, the current Wood’s lamp results are still relatively accurate. Wood’s lamp is generally used in clinical practice for pigmentary abnormalities, or infection-related skin diseases, or skin tumors, porphyrias. It is also considered to have a good application in the diagnosis of diseases such as melanosis and scleroderma. Wood lamp examination is simple, convenient, and does not bring pain to the patient, so currently in the clinical Wood lamp is also considered more worthy of promotion and trust in the examination. For example, like vitiligo, and like Malassezia folliculitis, pemphigus foliaceus in the diagnosis of these diseases, Wood’s lamp is to do the test, it is not a substitute for dermatoscopy, and it is necessary to look at the same time with the combination of pathological examination.