I have been used a skin care product to get rid my acne for
around 3 months.
But suddenly, the small area below my lips, the skin color turns a
bit brown...
Can anybody tell me, what is that? Is that irritation/inflammation
becuase of the product? How to cure it? What happen if I stop use
the product and let it be like that, could it be healled just by
time? Or should I consult a skin specialist?