The goal of this clinical trial in adult patients diagnosed with upper extremity lymphedema is to test the safety and effectiveness of small, wearable sensors that may be able to measure lymphedema. The main questions this study aims to answer are: * Do these sensors detect lymphedema? * If so, how accurate are these wearable sensors? Participants will complete one in-person measurement session and one phone call with study staff 14 days after the measurement session to check-in on the participant's well-being.