Differential Diagnosis – Swelling on the Upper Back 1. Lipoma– Soft, mobile, painless; most common benign fatty tumor 2. Sebaceous Cyst (Epidermoid Cyst)– Dome-shaped, may have central punctum; can get infected 3. Abscess– Painful, red, warm; often associated with systemic signs if infected 4. Soft Tissue Sarcoma– Painless, deep, progressively enlarging mass; requires urgent evaluation 5. Muscle Herniation / Myofascial Rupture– May follow trauma or overuse; swelling increases with activity 6. Ve