Fillers and Botox - test area first?

[3hoursaway]

I don't want to end up with a bad reaction a la Leslie Ash (poor thing), do they test the product in an inconspicuous place before the actual treatment?

Not that I'm aware of. After your consultation, it's all systems go !
There are different fillers for different areas, once the syringe is loaded, is yours to pay for, not cheap.
What are you considering having done OP ?

But what about adverse reactions etc? I hate the lines by my nose

I think Leslie ash used permanent filler, and it was a very long time ago and these things have come on massively. My friend has her nose to mouth lines filled, looks great.