My experience is that patients bruise three different ways. The first is the big bruise, which starts almost immediately. Usually the docs see a flash of blood drip immediately after removal of the needle, or immediately see swelling. Those tend to create large, week long bruising.The second is a more moderate result, which tends to blossom within the first 24 hours. These are harder to predict, but luckily happen fairly infrequently. The third is often delayed a few days, and show up maybe two or three days later. They occur from deep bruises that take a few days to finally come to the surface. Because they are deeper, they also seem to take longer to resolve.As others have pointed out, the bruising is overall rare. Some areas like the eye region or prejowl sulcus bruise more often. Other areas like the cheeks don't tend to bruise. There is little that an injector can do to prevent them, other than gentle professional technique. The simple passage of a needle into the skin starts the process. Avoiding aspirin, ibuprofen, or naprosyn for a week helps. Also fish oil, high dose vit e, and a few other more obscure herbs or supplements. If you do bruise, we offer arnica cream or pills, and IPL treatments to break up the bruising as fast as possible.