Scalp of an African American female patient with seborrheic dermatitis and alopecia. Seborrheic dermatitis is an inflammatory disorder where the skin becomes flaky, itchy and red. It occurs especially in areas rich in oil-producing sebaceous glands, such as the scalp and around the nose. It can be triggered by fungal infection, stress, as well as hormonal, genetic, and immune system factors. Alopecia results in hair loss from some or all areas of the body, which may be permanent. It is thought to be an autoimmune disease and often results in bald spots on the scalp.