Eczema, also known as seborrheic dermatitis, is extremely common in people of all ages. It causes dandruff on your scalp or patches of rough, itchy red skin on your body and face. It’s often triggered by stress, allergies or poor diet. Luckily, eczema is one of the easiest skin conditions to treat at home. Keep the area clean and dry, avoid using skin care products containing harsh chemicals and apply anti-itch cream. Oatmeal baths are particularly soothing.