The main cause of little finger curvature is damage or deformation of the skin, tendons, joints and other structures at the little finger. Common factors include tenosynovitis, skin contracture, palmar fascia contracture and congenital small finger deformity, etc. Treatment includes tenotomy and decompression, palmar fasciotomy and so on. 1. Tenosynovitis: It can occur when the patient’s hand joints move too much, and the patient will have edema of the tendon sheath, which will cause tendon compression, and the tendon compression will hinder the normal activities of the little finger, making it unable to straighten. 2. Dermatoconstricture: the incidence of the population is mainly children, dermatoconstricture will lead to skin tension, so pulling the little finger can not make it straight. 3. Metacarpophalangeal contracture: the incidence of the population is mainly middle-aged and old people, mostly in the history of alcohol, smoking history and the palm of the middle-aged and old people who have suffered trauma. The patient’s palm can be touched with fibrous thickening and bead-like hyperplasia hard knots. In the later stages of the disease, contracture pulls on the little finger, leading to curvature of the little finger. And the curvature will be further obvious with age. 4. Congenital little finger deformity: congenital little finger curvature deformity is extremely rare, the cause is unknown, the patient can show the skin of the palm of the hand as well as the shortening of the anterior flexor muscles of the little finger, in addition to the patients of the palm of the hand of the subcutaneous tissue can appear fibrous tissue hyperplasia formed by the fiber layer. If this symptom occurs, it is recommended to consult a doctor in a timely manner to identify the cause of the disease and early formal treatment, so as not to delay the condition.