hi doc, I am 18 years old. My lips have become dark and dry. I was really surprised when I realized that they have been unusually darker than the normal. When I compare my lips with that of other girls, mine is a bit darker especially the edges. I suspect that the facial medicine use for anti-acne (i have acne) have caused my lips to darken. I believe that the facial soap that i use contain sulfur. I also use astringent and an depigmentation cream and another cream. I don't know what it is but i guess it's a sort of a sunblock. These meds are all from my dermatologist and i have been using them foe almost two years. I can't stop using them because they help minimize my pimples. I really want to bring back my pinkish and light lips. I would really appreciate your help. Thank you.