A punch biopsy is a medical procedure used to obtain a small sample of skin for examination. During the procedure, a doctor uses a circular blade to remove a cylindrical piece of skin, which includes the epidermis and part of the dermis. This sample is then sent to a laboratory for analysis to help diagnose skin conditions, such as skin cancer or dermatitis. The procedure is typically performed under local anesthesia, minimizing discomfort. It is a quick process, often taking only a few minutes, and the site may require stitches to promote healing. Patients may experience minor pain or swelling afterward, but serious complications are rare.