Lymphovenous Bypass Procedure Before Underarm Lymph Node Surgery in Preventing Lymphedema in Patients With Inflammatory or Locally Advanced Non-inflammatory Breast Cancer or Melanoma

This study is testing whether a surgical procedure called lymphovenous bypass — done before underarm lymph node removal — can prevent lymphedema (painful arm swelling) in patients with breast cancer or melanoma who need lymph node surgery. Lymphedema is a common and often permanent side effect of removing lymph nodes under the arm. **You may be eligible if...** - You are at least 18 years old - You have inflammatory breast cancer or locally advanced non-inflammatory breast cancer requiring removal of underarm lymph nodes (axillary lymph node dissection) - OR you have melanoma of the arm or shoulder area requiring underarm lymph node removal - You are willing and able to participate **You may NOT be eligible if...** - You have already developed lymphedema - You have had prior surgery to the same underarm area - You have a condition that would make the bypass surgery unsafe - You are unwilling or unable to provide informed consent Talk to your doctor to see if this trial is right for you.