Which he-sea point is used particularly for treating itching of the scrotum?

The he-sea point specifically used for treating itching of the scrotum is KI-10, known as Yin Gu. This point is located on the kidney meridian, which plays a crucial role in governing water metabolism and genital health. Kidney function is intricately linked to reproductive health, including issues related to itching and discomfort in the scrotum.

In Traditional Chinese Medicine (TCM), KI-10 is associated with nourishing kidney yin and clearing heat, which can be beneficial when itching is a symptom of excess heat or dampness leading to irritation. Thus, this point can help restore balance in the body and alleviate symptoms effectively.

The other choices, while they may have their own therapeutic uses, do not specifically target symptoms related to the scrotum or genital discomfort as effectively as KI-10 does. For example, BL-40 is often used for back pain and disorders of the lower body, LI-11 is more focused on clearing heat and cooling the blood, and PC-3 has applications for heart and forearm issues, rather than the specific condition related to scrotal itching.