is not precancerous condition
, so do not worry. You have no chance to develop cancer. However, Ca skin may occur on sun exposed area after long time exposure to sun.
Darkening of face may be the tanning
effect. So, avoid sun exposure or take protection from exposure to sun. You may use sun screen lotion or cover the area.
Antioxidants or vitamin C
may be taken.
I hope you got my answer.
Dr. Ilyas Patel MD