I have four nipples!
The Jon-E warmer that I used last week, I had too close to my skin, and burned two nice red spots on my chest, both within an inch of my “actual” nipple./ SO it looks like I have supernumerary nipples.
The skin has peeled off one, and it looks like it may start to suppurate. Joy!

It’s great being easily amused, isn’t it?
If you start lactating, post a photo.
DUDE!
If you could come that close to burning off your nipples, which have only a few less nerve endings in them than your little Captain, AND NOT KNOW IT WAS HAPPENING, you have a neuro problem of some kind that needs checking out.
Go see your main doc and get a referral.
Or else, this is the human equivalent of slowly boiling a frog.
BTW, when I had Jon-E handwarmers, back in the days when I used to ski, I was told to wear them near the kidneys, and in fact, Jon-E sold a belt to put a couple of them in at just that location. I never heard of wearing them on the upper torso.
Jon-E Warmers? Those things still exist??