^ Haha, agreed. He can’t do much to prevent something like that other than try to inform his clients of the risk and hope they listen.
We would know because they would come in occluded. If they don’t then whatever they would be using would not be that effective. If they just took the wrapping off, then the area with the cream would be lighter than the rest of the body and the skin would be slightly greasier.
Our main concern is not the cream that customers use but rather what they take prior to treatment to alleviate the pain without telling us.
You can’t save people from themselves. A clinic is not responsible for anything they haven’t specifically recommended or asked someone to do.