I had ruined my skin with too much sun and solariums. I was covered in messy pigmentation/freckles completely.
I went in for one session of IPL resurfacing on arms/back-shoulders/chest and while it was very painful, and recovery a few weeks, it was worth it! Unbelievable results and all from one session! Other places told me 4 would likely be needed but apart from the odd light freckle now (they were very dark in some spots) my arms in particular are very clear. One more session would likely completely clear up - worth it completely.