Hello..... Swollen of feet is called Pedal edema. The most common physiological cause is gravity. As you described long sitting in car. In that case it may appear but after taking rest i.e. in supine position for few hours, it automatically subsides. In your case, it is slightly different. Because swelling gradually increases and became tense pinkish skin. Sometimes, it may be cellulitis due to prolonged thick edema super added with infection. So in my opinion, you raise your legs through out the day as much as possible u can. I means sit with folded legs, lie with some pillows below your legs and avoid standing prolonged time. Besides this, you can start Tab Torsemide 20 mg once a day with Tab Trypsin and Chymotrypsin twice a day. If not relived within 3 days then start antibiotics like Cap Amoxicillin + Clavulanic acid 1 gm twice a day for 5 days. Thank You