Hello! 2-month old baby, after two weeks ago they shaved his head with…

Hello! 2-month old baby, after two weeks ago they shaved his head with a machine, since then several pustules have appeared on his head, there is milk crust, then the pustules burst and dried up as dark spots, the head itself itches because he keeps pulling his hands to his head, when the pustules were popped, I treated them with peroxide. Suggest something to wash or how to get rid of it? As I notice white pustules also appear on eyebrows periodically.