An entry-level OTR is evaluating a client who has persistent swelling of the non-dominant extremity after undergoing a mastectomy 4 weeks ago. The swelling interferes with the ability to complete fine motor tasks and does not decrease with the use of elevation, ice, or active ROM exercises. The OTR notes the client’s affected upper extremity is firm to the touch and there is no pitting of the skin. Results of a volumetric test indicate the affected upper extremity displaces 20 mL of water more than the non-affected extremity. The client has full functional active ROM of bilateral upper extremities. Based on these results, which action should the OTR take to MOST EFFECTIVELY manage the client’s edema?