Breast milk can be used for milk skin irritations like diaper rash. You should rub breast milk into the affected area and allow it to dry before you use a barrier cream and a new diaper. Breast milk also works well for mild eczema. For chapped and sore nipples, you can allow some breast milk to air dry on your nipple. It works just as well as most creams. Other uses are for insect bites, sunburn, and other skin ailments.