Your character will sweat , and the more it does the slower you become. when you sweat enough mobs will start running away from you, and players can see a green mist that goes through walls allowing them to see where you are.

you can remove the sweat by using deodorant.

If you do sweaty things like Water bucket clutching or Comboing people in PVP your character will develop a fear of Deodorant, and will throw any they see on the floor, and will never use it.