I just had a HT and from my understanding you can use Dermpatch about 10-14 days after HT, on the non transplanted area, I think you can use after a week. YOu must wash out real good each day of use so that the pores dont clog up with the makeup. As far as the hair dye or hair color, I was told to wait for 6 months to be on the safe side? Personally I'll wait at least that long--maybe 9 month. (I dont want to damage any $$$ FU's or comprimise growth)