An 18-year-old young girl, who was on a graduation trip and was staying away from home, began to have itchy hands about 2 months later, and the itchy condition lasted for 2 months, with slight peeling and redness, and was diagnosed as “hand eczema” by an outside doctor. A young soldier, 23 years old, often camping in the wilderness group, one day began to feel itchy and peeling all over his body, and found that several brothers in the same group also had itchy and peeling symptoms, originally thought it was the sweat often, causing the phenomenon of sweat rash, so continued to apply drugs indiscriminately for 4 months, but still could not improve, and then went to the Department of Dermatology of the Hospital for consultation, and was diagnosed with scabies. The grandmother, who lived alone at the age of about 70, had difficulty moving, poor self-care ability, and poor immune system, and her home environment was humid and unclean, so she was extremely itchy and had severe peeling all over her body, and sought help from our dermatology clinic and was diagnosed with Norwegian scabies (scabies infection with more than 100 insects). The scabies insects are small, about 0.3 mm in diameter, nearly round or oval, and almost invisible to the naked eye, and feed on human skin keratin. However, if the infection is in a patient with an abnormal immune system (problematic perception of itch), it often leads to severe Norwegian scabies, which has a crusty, thick skin appearance, and these crusts are covered with more than 100 worms. The traditional method of scraping the skin for scabies examination requires scraping the lesion and the surrounding skin with a dissecting blade, placing the collected specimen on a slide, and examining it under a microscope with 10% potassium hydroxide, which can easily cause the skin to bleed during the process, and children or young children cannot cooperate in the examination process, which often causes difficulties in the operation of the examination process, and the sensitivity is not high, and even if no evidence is found, the possibility of scabies cannot be ruled out. The possibility of scabies cannot be ruled out even if no evidence is found, and delayed diagnosis may sometimes result in the risk of spreading the infection. In addition, because scabies is a highly contagious disease, direct contact with the patient during the procedure may cause infection in the medical care if not careful. Cathay? Dr. Hsu Chieh-ho, an attending physician at Cathay Hospital, broke through the traditional scabies examination method of skin scraping and used a non-invasive, non-contact dermoscopic method instead, and has successfully diagnosed dozens of cases so far. Non-contact dermatoscopy is the second generation of dermatoscopy, both of which use optical principles to reduce the refraction of light from the cuticle to clearly see the structure of the epidermis and upper dermis as a tool to identify skin pigmented lesions.” The non-contact dermatoscopy method is a new type of dermatoscopy that replaces the traditional dermatoscopy that requires gel for conduction and uses 32 LED ring light sources to clearly see the tunnel-like traces of scabies crawling through and the triangular-shaped black body of scabies to quickly diagnose scabies. This new diagnostic method was published in the latest issue of the Chinese Journal of Dermatology, and Dr. Hsu also used dermatoscopy to diagnose a rare hair disease (beaded hair disease), which was accepted for publication in the international medical journal British Journal of Dermatology.