Why Didn't I See Results After Photofacial?

I recently had a Photofacial on my upper chest area and saw no changes from it. I previously had some on my face at a different clinic years ago and remember getting really dark spots where damage was healing.

I’m wondering if the technician just had the settings too low or if the wavelength was different? I thought I remembered seeing flashes of blue light when I had my face done and it was certainly more painful. I could be wrong about the blue but I remember being surprised when I kept seeing flashes of red light at each pulse this time.

It’s been several days and absolutely nothing has happened, no redness, no spots, nothing. Would this be the intensity or the wavelength that is off because I have plenty of sun damage? Thank you so much.