After an ambulatory micro-phlebectomy, you can resume normal daily activities such as walking, driving, and working.  Most patients have no discomfort or minimal discomfort after the surgery. Occasionally there can be a small section of retained vein, or a side branch, which can develop a harmless but painful phlebitis. A superficial vein phlebitis, also called superficial thrombophlebitis, means inflammation and closing down of a vein section.  It usually causes a tender, swollen, red area under the skin.  The redness lasts about a week, the tenderness lasts several weeks, and the lumpiness can last several months.  Ultimately it all resolves and rarely leads to a dangerous situation such as a deep vein thrombosis (DVT) or infection.
Treatment of superficial vein thrombosis consists of taking anti-inflammatory medication such as ibuprofen (Advil), naproxen(Aleve), or aspirin,  and placing cold compresses or warm compresses on the tender area.  Just like a sprained ankle, I recommend cold compresses the first 24 hours after onset, then transitioning to warm compresses or heating pad for the next several days.
A post-operative superficial phlebitis after a micro-phlebectomy does not mean the varicose veins will come back.  Proper treatment of the deeper saphenous veins that feed the varicose veins is important in preventing new varicose veins from forming.