See doc: The most common type of rash leading to discoloration in the corners of the mouth is something called angular chelitis aka perleche. This arises due to an increase in moisture which causes irritation and sometimes a yeast component. Any information on the skin/lips especially in darker skinned individuals can lead to a discoloration. However i would go see a doctor to probably diagnose and treat this.
Answered 8/4/2018
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