My ears are really dry on the outer part and they are really itchy and when i scratch them they burn really bad. what would cause that?

Dermatitis: You might be allergic to a shampoo or other skin or hair care product, causing an irritation of your skin.

Maybe it is eczema: It is difficult to tell exactly what you have, but likely it is eczema--which is quite common. Itching typically causes scratching and excessive cleaning which often makes it worse. Fungal infection can also cause itching. If you have rashes elsewhere such as elbows/knees etc...Then more likely eczema. Try some otc cortisone cream, and minimize excessive cleaning/drying. Consult doc. Good luck.