hello sir,i have a dark horizontal line on nose it came when i was in my teens and now after 4/5 yrs it has became worse.it had come naturally firstly it was a light line bt nw it is visible. the area on middle of my nose has became a little bit darker and same goes with the skin around my chin. it has darkened covering the area of my lower lips and side. do suggest me some good remedy and the reason behind this darkening.