Skins that overwrites default skins

Hi all,

If i import a skin that replace a default skin into my custom map. Will it replace the skin for other maps or just the map i imported the skin in?

I am abit confuse because i notice some maps like Tides of Blood did replace my skin when i play melee map after downloading. But Diablo 3 Warcraft didn't.

Clarification would be much appreciated! Thanks in advance to those who help me [:

Just the map you import it in.

Some buggy stuff happen sometimes when you play a custom map and then go to another one, but it gets fixed with a quick restart, there isn´t any permanent change with imports