What is the Main Cause of Seborrheic Dermatitis? The main cause of Seborrheic Dermatitis (SD) is gluten. Wheat, barley, rye, and oats are all major contributors to seborrheic dermatitis. Why? One word, GLUTEN. You may have a wheat/gluten sensitivity (think allergy), not necessarily a celiac disease. Although, if you have seborrheic dermatitis, it is recommended...
