In what situation would a barber need to refer a client to a doctor?

A barber should refer a client to a doctor if the client has a skin infection or severe scalp irritation. This is crucial because both conditions can pose serious health risks and may require medical treatment beyond the scope of a barber's training. Skin infections can be contagious and could lead to further complications if not treated properly, while severe scalp irritation might indicate an underlying condition that needs professional evaluation. By referring the client to a medical professional, the barber ensures that the client receives appropriate care and can address their health issues effectively. This proactive approach not only prioritizes the well-being of the client but also maintains a safe and hygienic environment in the barbershop.