What can I use over my scar to help the appearance after lip lift revision, and how soon can I start to apply it?

Scars take a full year to mature so it is important to take care of it for one year after surgery. The three things you should do right after surgery are:1) Protect the scar from direct sun light --- It is not the same thing as applying sunscreen. You should have a hat or umbrella to shield the scar. This should be done for up to one year2) Bacitracin or aquaphor ointment to keep the incisions moist and speed healing 3) Take vitamins for wound healing (vitamin A and C, zinc)After the wound has healed and is fully closed at 2 weeks, if there are concerns for a raised scar then you can start applying silicone gels or sheets. Do not use OTC Mederma - there is no evidence in its benefits for scars. You can also start to massage the wound but get approval from your surgeon before doing this. If the scar is a thin white line without raised appearance, that is probably the best outcome you can achieve. Any incision on the face or body will leave a scar and they can be imperceptible if the wound was closed meticulously, the incision was well placed to hide the scars, after care was appropriate, and the patient did not have history of keloid or hypertrophic scarring. 

Discuss scar management with your surgeon.  It is best to avoid sun exposure until the scar is healed.  You could try some of the over the counter scar creams.  I feel that the rubbing does more for the scar than the cream, but it is worth trying.