Final answer:
The role of the cosmetologist is to provide supportive care and treatments that do not interfere with the client's prescribed medical treatment for acne-prone skin.
Step-by-step explanation:
The role of the cosmetologist when a client with acne-prone skin is under medical care is to provide supportive care and treatments that do not interfere with the client's prescribed medical treatment. The cosmetologist can offer advice on skincare routines, recommend non-comedogenic products, and provide facial treatments that are appropriate for sensitive or acne-prone skin. However, it is important for the client to follow the guidance of their dermatologist and use any prescribed medications as directed in order to effectively manage and treat their acne.