So the new tattoo trend is armpit tattoos! It looks like it's gaining more and more popularity recently. This looks like it would hurt a lot. Well, I'm almost positive it does. It is said that the armpit is one of the more sensitive areas of the body to get tattooed. I believe it. I have a sleeve and I don't think I would add this into it. It might actually be kind of ticklish too, don't you think?