Inward bending of the indicator is usually caused by congenital factors, tendon ligament injuries, and stenosing tenosynovitis of the deep flexor muscles, etc. You should consult a doctor to find out the cause of the problem. 1. Congenital factors: Inward curvature of the indicator may be due to congenital developmental problems. Skeletal deformities are usually hereditary and have no effect on health. 2. Tendon and ligament injuries: generally caused by trauma, such as falling from height, accidental impact, serious traffic accidents and so on. The main clinical manifestations are localized swelling, pain, tissue bleeding, joint swelling, bone deviation pointing to inward curvature, movement disorders and other symptoms. If the tendon ligament injury, should stop the current activities, so as not to aggravate the injury. 3. Deep flexor stenosis tenosynovitis: it is caused by repeated and continuous friction of local tendons and long-term overstrain, which can be manifested as inward curvature of the indications, pain at the lesion site and restriction of activities, and sometimes popping sound can be heard. Inward bending of the indications may also be caused by other reasons, such as palmar fascia contracture. If physiological causes are ruled out, the patient should consult a doctor to determine the specific cause and, if necessary, undergo appropriate treatment.