[QUESTION] What is this? How to fix?

You may have to use dilate.exe to remove these pixels, if I understand what you're saying.

Here's a link to it. (click me) This is NOT virus, I promise you.

Once you have it downloaded, put dilate.exe into the same folder with your skin/gameskin in it. Then, drag your skin/gameskin onto dilate.exe. Your problem (if I understand what exactly your problem is) should be fixed.

If this does not fix your problem, I don't really know what else to say. I don't see any problems, I might be blind.

drag and drop the graphic INTO the dilate.exe

Well, some skins just work like that. Some may look fine without custom colors, but others look bad.

I don't really know what else to say, I hardly understand your problem. Perhaps you can get one of your Ukranian friends to help you translate your problem more clearly? : )

and the inkscape or gimp or whatever file, if possible.

I working in Photoshop. This is bad?

The file format is somehow corrupted. Teeworlds does not show it up.

furthermore the first skin does not have any greys. What do you want to colorize then? Black and white cannot be colorized.

I'm sorry, I cannot help as I don't understand your problem.