- dry itchy skin, often erythema with vesicles or scales
- bilateral symmetry
- flexor surfaces, esp. antecubital fossa, popliteal fossa, volar wrist, neck
- cheeks in children
- Onset in childhood
- psoriasis (extensor surfaces, not so itchy)
- contact derm (focal; not bilaterally symmetrical)
- seborrheic dermatitis (eyebrows, forehead, bridge of nose)
- photodermatitis (acute onset, sun-exposed areas only)