My nipples were numb on and off for about the first 7 days, there both fine now, I have one little bit under my left nipple, on the underneath of my boob that’s still numb, but hoping it comes back. I’m only 2 1/2 weeks post op tho. I had a nipple lift as well as a BA so I’m expecting to be numb and bruised longer, especially as I had unders too.
Try not to worry, even at 4weeks post op, your still early days xx