the foot of sand flea usually refers to sand flea disease, which is caused by parasitism of female sand flea after invading human body. Generally, it will show redness, pain, itching, etc. In severe cases, local ulceration will occur, and after taking out sand flea, it usually cannot be fully recovered.

This disease has great influence and harm on human body, and the harm is generally irreversible. Even if it is treated by surgery, it is difficult to achieve complete recovery. Surgery can only control the disease, but it is difficult to recover the removed part.