23 YR OLD WOMEN HAS PURPLE COLORING ON LIPS TOP AND BOTTOM, BOTTOM PURPLE COLOR HAS GONE AWAY BUT THE TOP LIP STILL ON THE PURPLE COLOR. NO INJURY TO THE LIP, SO IT IS NOT A BRUISE, NO CHANGE OF EATING OR TOOTHPASTE USE. WHAT CAN BE CAUSING THIS PURPLE COLOR OF THE LIP?

Optional Information:
Female , Age: 2

Already Tried:
nothing