I'm 25 years old girl ,I have melasma on face but after few month its all gone away but 1 week ago I had unprotected sex with bf and I used unwanted 72 emergency pill due to scared of pregnancy and now my melasma is come again on my face and nose its looks very bad ,please doctor please what should I do ,I want my face as its look as before ,so please suggest me what I have to do now .I m kindly request you.