Dandruff, Epidermal barrier, Malassezia, Sebaceous gland, Seborrheic dermatitis. What is Seborrheic Dermatitis? Seborrheic dermatitis causes scaly, oily patches of skin that produce dandruff – like flakes. These patches often appear where there are more sebaceous (oil-producing) glands on the body. This includes the hairline, scalp, upper back, nose, and groin. Root Cause of Disease If…