Hi Welcome to the HCM I have gone through your question and understand your concerns. It seems that your son is suffering from fungal (Candida albicans ) nappy rash. The main cause of nappy rash is wetness from contact with wee and poo in a nappy. Newborns wee often and do frequent, runny poos. Even the most absorbent nappy leaves some moisture on a baby s delicate new skin. This then makes it harder for your baby s skin to work as a barrier, making it more likely her skin will become irritated. You may take the following measures to treat him: -Keep your baby clean and dry by changing her nappy frequently. -Clean your baby s bottom using fragrance-free and alcohol-free baby wipes (check the label) or a mild, moisturising cleanser. Rinse your baby s bottom in plain water and pat her skin dry. -Give your baby as much nappy-free time as possible, to allow the air to aid healing. -Apply a thin layer of barrier cream or ointment before putting on a clean nappy. Apply Nystatin lotion over the area to treat the present yeast infection. If your baby s nappy rash is the result of an allergy, the problem should clear up on its own as long as you don t use the product that set off the rash. Hopefully this will help you. I would be happy to help you in any further questions. Take care