What causes a red pimple at the back of the neck of a 5 week old?
Patient: Hi. My baby is 5 weeks old and we just noticed that she has a red pimply red on the top of her back and the back of her neck. She has a little rash, same one as the back, on her chest. We changed over from breast milk to formula milk, just yesterday. Could this be the cause of the rash? And if not, what is the cause of the rash and how can we treat it? Doctor: changing milk has no relation with the pimple. it's called a neonatal pustule quite a common finding in newborns. count the number of pustule she has. if it is more than 10 then she might need to be seen by a practitioner. cleaning it with betadine douches and keeping dry will be enough.