Pediatric congenital tenosynovitis occurs in infants and children between the first few months of life and 4-5 years of age and is different from stenosing tenosynovitis in adults. The main cause of pediatric congenital tenosynovitis is that the child’s nervous system is not well developed and the coordination of flexion and extension of the fingers is low; or the child’s fingers are often involuntarily in a state of flexion and tension due to habitual finger flexion and finger biting, or forceful grasping of toys, etc. The prolonged bending of the thumb causes inflammation and edema in the tendon sheath of the finger flexor tendon, and a hard nodule the size of a green bean appears under the skin near the joint of the finger. A painful pressure, passive flexion of the thumb (and occasionally other fingers), difficulty in extending the finger, painful passive extension of the finger, and a “trigger pull”-like popping sensation. If left untreated, some children may be unable to straighten their fingers due to prolonged flexion contracture of the finger flexor tendons, resulting in finger dysfunction. If congenital tenosynovitis in children is detected early by parents, there is usually no need to be overly nervous. Do not press and squeeze the hard knot of the affected finger, hot compress stimulation, because this will only aggravate the local edema, is not conducive to the dissipation of inflammation, there is no help for the straightening of the finger. The correct way to deal with the problem is: parents can gently hold the end of the affected finger, slowly pull the affected finger straight, keep the extended finger position for a few minutes, and then release the affected finger. If the affected finger returns to the flexed position, repeat the pulling process. This procedure can be repeated 5-10 times, 2-3 times per day. The vast majority of children will return to normal within a few days. In the rare cases where this method is ineffective, or where flexion of the affected finger has been prolonged and a contracture of the flexor tendon has occurred, surgical release is required at a children’s hospital.