Mouth skin is dry and itchy, what's the matter?

1. The weather in Australia is relatively dry, close to the climate in northern China. Because you come from the south, you are not used to the climate there, which is one reason.

2. The mouth is not clean after eating or drinking water, and the skin will itch when the wind blows.

3. Or because you are angry. It is recommended to drink more water and eat less spicy and exciting things.