A **Back Swelling – Medium Biopsy (1–3 cm)** refers to the surgical sampling of a subcutaneous or intramuscular growth located on the posterior torso measuring between 1 and 3 centimeters. This procedure is performed to obtain a definitive histological diagnosis, allowing clinicians to distinguish between benign entities—such as lipomas, sebaceous cysts, or fibromas—and potential malignancies. The process involves local anesthesia, an appropriately sized incision, and precise tissue extraction. Pathological evaluation of this sample is critical, as it confirms the lesion's cellular architecture and nature, directly guiding subsequent clinical management, surgical excision plans, or necessary therapeutic interventions.