What is it if my baby has dry chapped skin behind the ear?

Baby skin: My first thought is that the soap/shampoo you are using is too drying for your infant. Despite what the baby soap manufacturers lead you to think, many baby soaps are very drying to infant skin. Decrease how often you bathe the infant, use a soap with a built in moisturizer, and use a lotion/cream moisturizer on dry areas once or twice every single day. Baby skin is thin and vulnerable to dryness.