What mistake did the esthetician make after grabbing a wet towel from the warmer?

Testing the towel temperature on the wrist is crucial because it ensures that the towel is at a comfortable and safe temperature for the client before application. An overly hot towel can cause burns or discomfort, while a towel that is too cool may not provide the desired effects such as relaxation or effective product penetration. By checking the temperature on their own wrist, the esthetician can gauge the warmth of the towel and verify it is suitable for use on a sensitive area like the face. This is a standard safety protocol in esthetics to prevent any potential harm to clients. Thus, failing to test the towel was a significant oversight in providing a safe and enjoyable experience for the client.