Dermoscopy in the clinic, in fact, is currently very commonly used means of examination, it is in fact in the patient’s preoperative time, do not need to carry out special attention, only need to try to keep a local lesion of the skin clean and dry can be. Because dermoscopy itself is a non-invasive examination, so patients do not need to worry about, may be in the preoperative local skin cleaning, or disinfection of this kind of operation. If the operation is to be carried out under the guidance of the dermatoscope, usually the doctor will be carried out before, the patient will be instructed, even if the skin disinfection, but also by the doctor or auxiliary caregivers to complete, and does not require the patient to carry out a separate treatment, so the patient does not need to be particularly fearful. Dermoscopy is actually mainly to look closely at the skin, as well as the subcutaneous microstructure, as well as the details of local lesions.