Hello and welcome to healthcaremagic I would keep a possibility of Nipple Eczema, constant sucking during feeding being the underlying cause. Females who have Dry skin/Atopic are more prone to develop eczematous conditions such as this. Avoid repeated washing/wiping/cleaning with water of the affected area because it would cause more dryness and can lead to painful cracks. I would suggest that you use an aloe-allantoin based cream/gel for keeping the area soft and moist, preventing it from cracking. A moderately potent topical steroid e.g fluticasone propionate cream once daily, after the bay has taken feed can be applied to hasten the resolution. regards