Is this baby acne, milk rash or heat rash? Few pics attached. Do I leave it to heal or apply something on it?

hi mummy, do not worry. it is cradle cap. the name sounds misleading, but it doesn't only grow on the scalp. but the eyebrows and the ears too. it will go away soon. 😄 my girl had it on her ears and scalp and eyebrows. I visited pd and was given a shampoo for cradle cap. there's shampoo for cradle caps too at kiddypalace. (: