<prompt> A 3 year old child has eczematous dermatitis on extensor surfaces. His mother gives history of bronchial asthma. Diagnosis isAtopic dermatitisContact dermatitisSeborrhic dermatitisInfantile eczematous dermatitis  <response>: Ans: a Atopic dermatitisRef: Rook, Vol. 1, 7th ed. pg. 18.2Criteria for atopic dermatitisMajor criteriaAn itchy skin condition plus 3 or more of the following1. Onset below 2 years2. History of skin crease involvement including cheeks in children under 10 years3. History of generally dry skin4. History of other atopic diseases5. Visible flexural dermatitis.Atopic dermatitis could be established if 3 of the major and 3 of the 23 minor criteria are present.Contact dermatitis is unlikely in this age group.Seborrhic dermatitis - The seborrheic areas like scalp, nasolabial fold, retroauricular areas are affected. 