Facial cleft skin examination is one of the most important methods of dermatologic examination. The light should be bright when examining the skin, preferably natural light, and fluorescent light is also acceptable. For skin diseases with a wide distribution of lesions, the skin of the whole body should be examined. Sometimes the patient’s hair, finger (toe) nails and mucous membranes should also be examined. Contact dermatitis and parasitic dermatoses (such as lice) are suspected, and their clothing should be examined. Sometimes the lesions can be observed with the help of a magnifying glass. The nature of the damage is clear: is it a primary or secondary rash; is it one type of damage or multiple damage at the same time. The distribution of the lesions is systemic or generalized; symmetric or unilateral; confined or disseminated; along the nerves, along the blood vessels or according to the skin area. 3. The arrangement of the lesions is scattered or fused; isolated or clustered. Whether it is arranged in lines, bands, rings, arcs, multiple arcs or irregularities. The size of the lesions is expressed in terms of centimeters and millimeters in diameter, or in terms of needle points, needles, mung beans, soybeans, walnuts, and egg sizes. 5, the number of lesions single or multiple. The number is best indicated by numbers. 6, the color of the lesions normal skin color or red, yellow, purple, black, blue, white and other colors. 7, the edges and boundaries of the lesions clear, relatively clear, blurred, neat, elevated, depressed, etc. The shape of the lesions. Round, elliptical, polygonal, curved, linear, ring-shaped, irregular, etc. 8.The base of the lesion Broad, narrow, tip-like, etc. 9.Surface Smooth, brown, flat, elevated, central umbilical fossa, papillary, cauliflower-shaped, hemispherical, conical, etc.