Went to see a dermatologist regarding about my rashes on my body. Doctor prescribe the medicine. He also said that he will include a bar of soap to be part of the medicine.

Now, I know that this bar of soap is a free sample given to the doctor. However, if the doctor charges you for the soap, do you think it is ethical for him to do so?

(Note: I am not saying that he charges for the soap because I did not ask him about it. It is better not to know in this case).

What do you guys/gals think?