@ysmina-- There are many natural treatments for inflammation and itching. Aloe vera, like the article mentioned, is a great one.
You can also try honey. You can apply honey topically on rashes and also eat it to strengthen your immune system. There are also other products made by bees such as propolis or royal jelly that are know to support the immune system.
For an itchy, red rash, I think vitamin E cream is beneficial. Something else that helps with rashes that most of us have at home is baby nappy cream. It has zinc oxide which soothes skin.