Hie, I have got pigmentation on lips. On upper lips its completely dark. Whereas, on lower lip just the lip line has darken. Its frm almost 4 5 year. I have been doing home remedies to treat that like applying purified butter and white butter, using potato juice on lips etc frequently. I also use branded cosmetics. But its not going away. I am too concerned about it as I cannot go out without applying colour on my lips. Please help me. Thank you in advance.