I got lip injections a few months back and a couple days after i started to get a “moustache” At first i thought it was bruising and now it’s still there. It’s changed the color of my skin it isn’t actually hair.
I have never seen that occur however there are some possible explanations.
If the filler did cause actual bruises, rarely but occasionally the bruises can permanently “tattoo” the skin.
Also if the filler was placed too superficially, it can create whats knows as the “Tyndall Effect” and show up as a bluish color.
I would make sure the doctor who injected you is aware of what happened. The best thing is to wait for the filler to resorb but do see your doctor and let him take a look.