Biopsy is to take a small piece of diseased tissue, make a section after medical treatment, observe it under a microscope and give a diagnosis or recommendation. The significance of biopsy: 1, determine the diagnosis of certain tumors and fungal infections and skin diseases with specific changes 2, suggest the diagnosis, microscopic changes suggest certain diseases, but can not be determined 3, consistent with the diagnosis, microscopic changes combined with clinical consistent with the diagnosis of certain diseases 4, description, or suggest further special staining or deep cuts Special reminder, biopsy is not a panacea, some diseases often require multiple biopsies to determine the Diagnosis.