Quackery is a derogatory term used to describe questionable medical practices. According to Random House Dictionary, a "quack" is considered a "fraudulent or ignorant pretender to medical skill" or "a person who pretends, professionally or publicly, to have skill, knowledge, or qualifications he or she does not possess; a charlatan." It is defined as the "medical practice and advice based on observation and experience in ignorance of scientific findings. The dishonesty of a charlatan."
See more at Wikipedia.org...
To see a quack doctor in your dreams, denotes you will be alarmed over some illness and its improper treatment.
Ten Thousand Dreams Interpreted, or "What's in a dream": a scientific and practical exposition; By Gustavus Hindman, 1910. For the open domain e-text see: Guttenberg Project