I have some black & shade ink on my upper thigh.. I've never jacked into it.
Needles, you know when the blunting happens, the skin resists them like a cow on a trampoline. Which can cause the odd bruise that soon dissipates..
Using some pretty large needles during my time when they loose the edge, the skin is the first to complain.
Pinching up does help. Back "in the day," it was how I was taught with the glass syringes.. (Which was the tech in the 50/60s still being used in the 70s.)
A smaller shaft these days with a finer point on the modern pen needles, probably makes em more susceptible to damage from the intended use. Injecting.
The early "telegraph poles" were certainly intended for multiple use with the same patient..
Below is meant to be the 4mm microfine jobbies.