I am 20 years old. In last 6 months my face skin has turned much darker all of a sudden. My face skin was 2 shade lighter than body but now it's 2 shades darker than my body. Even when I shave it becomes more darker. Now I have stopped shaving. I went to a dermatologist he gave a sunscreen and salicylic acid face wash but after month usage my face went more darker. I also used for berberis aquifolium for 3 months .i am using sunscreen for last 2 years and I apply it 30 min before going out ,but the doctor gave me new suncros sunscreen but after all these there was no change. I also wear hat and mask whenever I go out.