Skin pigmentation (Acanthosis nigricans, lat.) gets worse under direct sunlight, and it is manifested through dark skin patches. Dark skin patches around the neck area, knees and elbows are a real aesthetic nightmare for some people.
The skin on both elbows and knees is a lot more wrinkled and thicker when compared to other body parts. Skin does not secrete oil in these areas, which is why they are mostly dry.
Insufficient care leads to even darker skin patches. The skin under your armpits is usually darker due to excessive use of poor quality antiperspirants and shaving.
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