I have red PIE from healed acne marks and wish I would have done the pulse dye laser sooner. Typically dermatologists recommend 3-5 treatments, usually spaced about 1 month apart. After one treatment there was a remarkable difference and after the second the redness was 95% gone. I waited about 8 months to do the next treatment as there were some more recent marks and the treatment wiped out all the red. So I personally did not need to do 5 back to back to get results and now