My baby has a smelly weeping skin infection behind one ear

My baby is 3 months old and for quite a while she has had a smelly weeping skunk infection behind one ear. I do try to keep it clean and dry but just can’t keep on top of it. I thought about putting pawpaw cream on it to act as a barrier but not sure if that’s right. It doesn’t seem to bother her much. She is fully breastfed.

please consult your doctor.