Alcohol After Fat Transfer or Grafting?

The reasons patients are advised to forego alcohol after any surgery are 1) it can interact with other medications, particularly pain medications, prescribed after surgery and 2) alcohol can 'thin' the blood and cause extra bruising. Delaying alcohol intake for at least 1 week and preferably 2 weeks should be sufficient to avoid any adverse events.

That is a very good question. I don't think there has ever been a good study to show when it is safe.
There is no question that alcohol can make you more prone to bleeding. I usually recommend waiting 5-7 days after surgery before taking other medications that can have a similar effect such as aspirin or Ibuprofen. I recommend this to my patients for alcohol as well...minimum of 5 days before having a drink.
But, there is also the possibility that alcohol may beneficial to graft survival in that it dilates your blood vessels under your skin and could potentially improve fat graft survival. Who knows?
I definitely would not recommend any of my patients drink alcohol during the first few days after surgery, and definitely not as long as they are taking the narcotic pain medication. But, once off the pain pills, maybe a drink (One drink) per day would be beneficial? I do not believe it would be harmful.