Final answer:
The selection of scalp areas in scalp acupuncture depends on the principles of Traditional Chinese Medicine and may vary by practitioner. Acupuncture could facilitate exposure to pathogens if sterile needles and proper hygiene practices are not used, as the skin barrier is penetrated.
Step-by-step explanation:
For treating diseases of internal organs using scalp acupuncture, the practice typically involves selecting scalp areas based on principles of Traditional Chinese Medicine, which may correspond with the affected area of the body. However, the precise methods can vary and should be performed by a licensed practitioner. There is no universally agreed-upon method for selecting scalp areas across all practices or conditions; it may depend on the specific technique or the practitioner's training. In modern practice, both traditional methods and evidence-based approaches are employed.
To address part two of the question regarding how acupuncture could facilitate exposure to pathogens, it's important to consider that acupuncture involves the insertion of needles through the skin. If proper sterilization techniques are not adhered to, this could theoretically create a pathway for pathogens to enter the body. To prevent this risk, it is crucial for acupuncture needles to be sterile and for practitioners to follow strict hygiene practices.