My LO had this for abt a month, went to polyclinic and they told us it was acne and to clean the face with water after each feed. But it suddenly became crusty and oozy, eventually diagnosed as eczema and baby had to apply topical steroid. Completely gone after 2 weeks of application. Now i use Mustela cleaning water moisturise TDS.
Will suggest to see Ped if concern!