There is a varied response in bruising between different individuals. There may also be a difference with the amount of bruising based on the technique of the physician. In general there may be minimal bruising but there also could be significant brusing, even several inches below the area treated. It might take up to two weeks for the bruise to be gone if it's on the face, and more if fat injections are done on areas below the neck. Makeup can be used to cover the bruising one day after the procedure. Avoid aspirin for up to two weeks before the procedure, and nonsteroidal antiinflammatory medication such as ibuprofen and others, fish oil, vitamin E, ginko, ginseng, garlic supplements as these may cause more bruising. Some physicians recommend taking Arnica and bromelain to reduce bruising, but not all do so check with your physician.