Hi Amber,
You raise an interesting question. I'm not sure what the risks are with laser treatments. I would suggest talking to someone at the spa. If it's a professional, high quality, reputable place, they'll know the risks involved. If they say, "Duh, I don't know". I might think twice about doing it! Your rheumy would be a good resource and if you have a dermatologist they'll know for sure.
I love your signature line. That is my favourite scripture! It's in my signature line too!
Blessings!
Ginny