This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Papulosquamous Disorders, Subject name: Skin
A 2-month-old baby came with rashes over groin & lower abdomen, esp. affecting the countours of buttocks. The erythema, edema and erosion spare the flexures. Mother gives h/o diaper use. Diagnosis? 
Select and explain. 
A. Irritant contact dermatitis, B. Seborrheic dermatitis, C. Candidiasis, D. Atopic dermatitis
A: Irritant contact dermatitis
Answer: A: Irritant contact dermatitis 
Explanation: Ans. a. Irritant contact dermatitisDue to contact to diaper, infants may develop contact irritant dermatitis over contours of buttocks. Seborrheic dermatitis in infants is commonly over scalp known as cradle cap.Candidiasis presents with satellite lesions.Atopic dermatitis involves flexures and face.