Photodynamic Therapy After Fraxel Laser?

Usually 3 -4 weeks is a good time frame to wait to give your skin the possibility to regenerate. The combination of both treatments may add benefit to treat actinic keratoses. 

One should expect to have some post-inflammatory redness and sometimes pigmentation after fractionated laser resurfacing such as the old Fraxel or Fractional CO2 Laser. You should wait until the post-inflammatory redness or pigmentation has faded almost completely before PDT. That usually takes at least 2-3 weeks.