My friend had lipo on his neck and it hardly bruised at all. He had to wear the bandages for 3 days then he put them on every night when he returned home for a weeks or so. As it is usually a small amount of fat removed and therefore less traumatic than removing litres from say thighs or belly there was less bruising for him on his face and neck. No-one would have been able to tell. Also the results take a few weeks to show so once the initial mild bruising has disappeared there are no great changes for anyone to see for a while anyway.
He had his tummy lipo'd at the same time and there was a lot of bruising there which took a couple of weeks to subside. The results again took weeks to see but now (just over a year on) the difference in shape is quite spectacular.