I recently had a seborrheic keratosis removed and it was a similar experience.
I also have a birthmark on my butt. When I was a teenager and saw a dermatologist who wanted to remove it (my mother has one, as does/did her brother, father and grandfather), my mother decided that was a good enough reason to never see that dermatologist again.
Regarding the device, I expect the privacy part to be because it could be worn underneath clothing.
NSFW Bull bag (also amazon) with a few more details.