My 4 week old son has rash on his face, eyelids and ears. should i take him to a doctor? not sure what is causing this

Patience: Baby acne is a common and temporary problem.It usually appears by age 2 weeks and disappears by 3 months. Keeping the skin clean is the major plan. If it persists after 3 months and or intensifies, some normal ace treatments can be beneficial, but the doc should look into unusual hormonal issues as a cause at that point. Water is okay but unnecessary. It won't change the skin issue.