Classical classification of atopic dermatitis according to the age range and topography of the lesions
| Age range | Distribution or affected area |
|---|---|
| Infant phase (birth to 2 years old) | Eczematous lesions typically occur on the cheeks, forehead, scalp, and extensor surfaces |
| School phase (2 to 18 years old) | They occur on the flexor surfaces (antecubital fossae, popliteal fossae, neck, wrists, and ankles) |
| Adult phase (from 18 years old) | Lesions on flexor surfaces may persist, but they are classically associated with lesions in the head segment (the upper portion of the eyelids and lips) |