Four month old Hispanic male baby with atopic and seborrhoeic dermatitis. Atopic dermatitis, also called atopic eczema, is an inflammatory skin reaction that occurs without any obvious external cause. Seborrhoeic 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.