Wearing a stick should not be part of Feng Shui, at least I have never heard of it, but it is a religious-like ritual popular in Hainan:
Wearing a stick is a folk custom in Hainan A common form of activity among activities.
The cane wearer uses a thumb-thick steel bar or iron thorn to pierce his cheek, and some even pierce his throat.
After the staff is worn, it is filled with coins, apples, etc. "offered" by others.
It is difficult to tell whether this is a performance or a sacrificial activity.
According to local people in Hainan: Those who perform wearing the staff must be possessed by a supernatural being before they can wear the staff.
The main material of the cane is silver, because silver has the function of stopping bleeding and sterilizing. If someone bleeds due to the cane, they usually touch the wound with silver powder, which can quickly stop the bleeding. Since the cane is usually worn on the cheek, there are fewer nerve endings in this part than in other parts, so there is less pain.