Swelling on legs. How to get treated?

Hi my father 71M, who is undergoing treatment for CKD , of late sees his legs swelling up to knee every day . When he sleeps at night or day the swelling goes off and combed back when he moves or walks around . He doesn't feel pain though , he is under Dytor 5mg 1 time a day for >2 weeks . The anklet region are bulged and so his toe fingers and itching sensation always persists . No swelling in any other part of body . He had urinary infection 3 weeks ago and under martifur 100mg 1 time a day. His creatinine level reduced from 4.5 to 3.2 and left kidney is non functional. His uric acid level fluctuates comes under control(4.9) and when medicine(buxstat 40mg)was stopped goes to higher level (7.9). So what this could be ? And how to get treated ?