My side effects: redness that calmed after the first day, and my darker freckles have turned even darker (I was warned that this is normal) and have begun to flake off. I know my pictures aren't the greatest, but you can see the big freckle to the right of my nose is now gone after only two days. Wish the pics were better so you could see the improvements. I am very pleased so far with this first session's results. I also had some very slight tenderness following the procedure. Hardly noticeable though and was gone the next day.
My only complaint is that the procedure is painful while it's being performed. If I could go back and warn my younger self that it would be my "punishment" for exposing my skin, I so would! The price I'm paying for my stupidity! I have to remind myself that it could be worse.
Regardless, I do recommend this procedure but only with someone who knows what they're doing. Do your homework!