This is what people often call a "wealth bag". Wealth bags will also increase year by year with age, and some will become harder and harder.
In severe cases, it is like a stone embedded in the back of the neck, which directly oppresses the cervical nerves, leading to poor meridians and blood flow, and the head can't move the soul and lift it. It can also cause a series of adverse reactions, such as pain, numbness and dizziness in cervical vertebrae and shoulders. , can be used externally.