Atopic dermatitis is a disease that progresses in attacks called flare-ups. The affected areas are often areas with folds such as the back of the knees or the inside of the elbows, but also areas where the skin is most fragile such as the face. During attacks, the skin, already very dry and uncomfortable, begins to itch, becomes red and may ooze. If left untreated, the surface can become itchy and expand, leading to infection.