Both corners of my lips became dark and rough. This is clearly visible. The area on the corners developed a black patch (Photo)

What is the cure for the problem? Is applying ointment or cream is enough for curing it? What are the internal medications and ointments I should take? In general how much time it will take for curing this problem? What are the reasons for problem? Details: I have this problem for 5 years and is expanding every few months. I have acne but doesn't have pimples around lips area. Sometimes, I have digestion problem.

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