I've copied and pasted below a post I did on my experience with tear trough fillers:
"Had tear trough fillers yesterday.
A numbing cream was put on beforehand. Right eye done first - surprisingly painless, apparently fewer nerve endings there.
It’s not done in the actual under eye area but around the orbital (?) bone. She examined the area first and drew on it for where to inject.
For the left eye, the bit nearer my nose was painful. So she used a canula instead in the upper cheek area to insert the filler. No pain then.
I kept very still as I was mildly paranoid about being jabbed in my eyes.
Apparently tear trough fillers aren’t like ‘regular’ fillers with an immediate effect - instead little drops are inserted which over the next couple of weeks will move to the hollows (fingers crossed). Though already they are somewhat less pronounced.
No bruising , swelling or discomfort.
Still thrilled with cheek fillers. Can’t stop looking at my cheekbones / profile and how less droopy I look!"