I had pigmentation on my cheeks so after consulting with a dermatologist I was recommended to have CO2 fractional laser. I followed all the pre-treatment medications prescribed by my doctor but after my laser from the 4 day my skin has become more darker then before.I am following all the post treatment medications prescribed for me. I am also trying to avoid sun exposure but sometimes I do have to go out and I use sunscreen with spf 50. Please help I am worried.