What is this brown patch of skin on my shaft? I've been to multiple doctors and they don't know [nsfw]

https://i.imgur.com/VQZRbWV.png
original: https://i.imgur.com/VQZRbWV.png
Dermatology
nsfw videos: Dermatology
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Sexy Agatha taking an outdoor shower
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![I've been posting for like 4 or 5 years. Do I still got it? [F]](https://i.imgur.com/fgskKCGm.jpg)
I've been posting for like 4 or 5 years. Do I still got it? [F]
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sucking his dick while he gets me ready
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![A little shake [f]](https://i.imgur.com/AhwgULkm.jpg)
A little shake [f]
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