Skin 3D CT is a new skin imaging diagnostic technology that utilizes the principle of laser confocal microscopy in a new generation of reflective mode to scan and image skin lesions with computer assistance. It is non-invasive, can be real-time, dynamic scanning imaging of skin structure, the image to the degree of light and darkness show different tissue cell structure, so as to assist in the diagnosis of skin diseases. First, its advantages are: 1, non-invasive is its biggest advantage, while maintaining the normal morphology and physiological function of the cellular tissues; improve patient compliance; 2, can be real-time dynamic monitoring, can be the same skin lesions for many times imaging, in order to its developmental changes, the improvement of the state of the improvement of the state of the observation of the treatment, high resolution – the cellular level, in particular, can be observed in the skin blood flow of the dynamic changes; 3, when the conventional tissue Pathology examination is difficult to determine the site of sampling, skin CT can observe many suspicious lesions in one examination, without the need for sampling and histopathology complex and cumbersome processing. The test is performed in the natural growth state. Save time and labor, and get the results quickly; 4. Imaging is rapid, and the data is easy to store and output. Images can be three-dimensional reconstruction. Skin CT is an emerging imaging technology; is a useful complement to histopathology; diagnostics and treatment assessment and follow-up of important means; for diagnosis/differential diagnosis/exclusion of diagnosis to provide clues; dermatological routine screening means. Application scope: 1, tumor skin disease: basal cell carcinoma, squamous cell carcinoma, mycosis fungoides, solar keratosis, pigmented nevus, hemangioma; 2, inflammatory dermatosis: contact dermatitis; 3, pigmentary diseases: vitiligo; 4, infectious dermatosis: warts, tinea versicolor; 5, dermatologic tissue typing: chloasma; 6, other: psoriasis, seborrheic keratosis, palmoplantar pustulosis, eczema.