Yeah no kidding.
After the swelling had cleared on that particular implant (2 or 3 days), I could see it was installed straight across atop one of the larger veins in my hand. I could even feel it pulse with the vein - not inside my hand, but touching it with my fingers. It looked and felt slightly odd, but it didn’t hurt or anything, so I let it be.
And then one day as I was fiddling with the implant during a boring business meeting, I noticed it didn’t pulse no more. I looked down, and lo, the vein had gotten out of the way all by itself!
Here, I’ve taken a picture of my hand in grazing light and annotated it to try and show exactly what happened:
Note that this is a coated implant. Had it not been coated, maybe it would have moved out of the way instead of the vein. Also, maybe the vein has moved because it was pushed out by the hard “blob” my body formed around the implant.