We have all heard of CT examinations, but did you know that skin can also be CT?Experts say that skin CT is an image, it actually refers to skin confocal microscopy, which can be non-invasive, painless and rapid skin cytology observation and differential diagnosis, providing help for the diagnosis and differential diagnosis of many skin diseases. Skin CT can quickly identify skin diseases 28-year-old Xiao Li, two years ago, there are many rice-grain-sized flat raised papules on the face, light brown, although there is no obvious discomfort, but for the beauty of Xiao Li, they have become a piece of heart disease. For this reason she sought medical attention, but received different diagnoses: flat warts, age warts, eczema …… She also tried to use many drugs externally and internally, spending a lot of time and effort, but never satisfactory treatment results. A hospital suggested that Xiao Li do a skin histopathology examination to confirm the diagnosis, but she refused to do so for fear of leaving scars on her face after such an examination. The hospital conducted a CT skin examination for her and diagnosed her with seborrheic keratosis, or “age warts”, which is often referred to as “age spots”. The actual fact that some of the rashes are very similar in appearance, and are diagnosed based on the doctor’s experience alone, can easily lead to misdiagnosis. If you want to confirm the diagnosis, the traditional method is to perform a histopathological examination, which is a small surgery to cut a piece of skin tissue, make a tissue section, and observe the lesions of tissue cells in the skin through a microscope to diagnose the skin disease. However, the method is invasive, bleeding and painful during the procedure, and it leaves scars and takes a long time after the procedure, which limits its application and is often not acceptable to patients. Nowadays, with skin CT, it is possible to perform skin cytology observation and differential diagnosis non-invasively, painlessly and quickly, allowing real-time, dynamic, three-dimensional imaging of the skin at the cytological level, and repeatable examination of the same area. With this method, we can quickly know exactly which skin disease we are suffering from.