How is the medical skill of blind doctors in Hume, Cheng Nan, Xu Shui?

This doctor surnamed Niu is a liar, and as everyone said, the prescription is the same. I checked the prescriptions for the second time and the third time, and they are exactly the same, but if you have to go there for three times and let you cook the medicine at his son's place, the medicine will be burnt. When you open it, it smells like a paste. If you throw it away, you think it's useless to go to Beijing to toss. I hope you are not afraid to drink it.