Ahong disease is also known as the disease of binding fingers, finger (toe) amputation or spontaneous finger (toe) detachment, which is an endemic disease in tropical areas. Due to chronic inflammation and fibrosis, the toes (fingers) become narrow and finally amputated. The name Ahong comes from Dongzuo ancient language, meaning to saw.1821Year Messue first mentioned this disease, which is a skin abnormality without known cause accompanied by bone resorption, and is an endemic disease in tropical and subtropical areas. The main feature is the appearance of a narrowing band around the fingers (toes) and spontaneous amputation. Ahong disease has a high incidence in black people. At the beginning of the disease, the skin on the flexor side of the distal interphalangeal joint of the fingers (toes) develops cracks, the dermis forms a circular fiber, appears a transverse groove and gradually deepens, and finally forms a circular concave groove, as if tied by a thin rope, the distal part of the fingers (toes) with the circular groove swells, can be painful, eroded, smelly. The circular groove becomes deeper and deeper. Generally5~10Years of natural toe (finger) amputation. Due to blood and nerve nutrient disorders, local bone tissue is progressively absorbed with the deepening of the soft tissue groove, and the residual end becomes sharp and sharp, and the histological examination is loose bone.