I'm sorry, but I do not have any experience with plastic surgery, but I have had several surgical procedures due to Lupus, although, they have all been performed in the US. As with any type of surgery, my best advice would be to be very careful. You should definitely get a full blood workup by your Rheumatologist here in the US before you go, even if you have been feeling ok for the past couple years, there's no way to know whats really going on without seeing the results from blood tests. You should also make sure that you will be in very good hands with doctors in Columbia if you choose to go ahead with the procedure. Make sure that they know what medications you take and if you have any allergies to anything. It helps if you have had surgery before so that you know how well you do under anesthesia since it can be very dangerous. You can never be too careful when it comes to your life and your health.
Also, I do not want to offend you, but have you tried any other non-surgical procedures to get the results that you want? Maybe start with some light exercise that you slowly increase over time and also diet changes? It will definitely take longer and a lot of mental and physical persistance, but it might be worth it. You will also save a lot of money because you won't have to get any kind of surgery at all!
I'm sorry I do not know what your situation is and how important it is for you to have this surgery, but I have had 2 DVTs and they were both extremely painful...not only that but the surgery I had to try to correct one of them was like being tortured in an operating room. They had to keep me awake while radiologists dug thru my veins trying to bust the clot out with balloon angioplasties and medication that risked brain hemorrhaging. They tried to keep me comfortable, but it was not fun and I will never forget the pain. AND the clot was so bad that the surgery was basically pointless...I will have to be on blood thinners for the rest of my life and I am still living with the clot and a slightly swollen leg. Anyways, not saying this to scare you or influence you or anything, but maybe trying other things like exercise and diet first might be more mentally and physically rewarding than surgery and painful recovery?
hope you keep us posted and take care!