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My Minecraft Skin has these really wierd pixels on the hands. It is attatched and so is a screenshot of the pixels. I am on Java Edition macOS. It happens on 1.8.9 and 1.16.5.
The "weird" pixels are part of your skin itself. If we zoom into your skin...
We can see that it is shaded with some noise.
There is nothing wrong with them. That is how Minecraft is supposed to look.
Here is an example: