A skin biopsy is a medical procedure where a small sample of skin is removed for examination. This sample is analyzed under a microscope to help diagnose skin conditions, such as skin cancer, eczema, or psoriasis. The procedure can be performed in a doctor's office and usually involves local anesthesia to minimize discomfort. There are different types of skin biopsies, including punch biopsy, shave biopsy, and excisional biopsy. The choice of method depends on the area being tested and the suspected condition. After the biopsy, the sample is sent to a laboratory for analysis, and results typically take a few days to a week.