why do my ears always get really red and hot?
like even when I'm just sitting in class.
The red and hot ears may be as a result of environmental conditions, intense feelings of emotions or changes in your hormonal balance. You should consult a physician so as to discover the exact cause of this.
You may be allergic to something. What happens just before your ears get hot? The reason I ask is that hot ears is the signal that I'm getting angry and need to shift the situation to reduce my anger.