The tendon bag is a cyst caused by hyperplasia of the tendon tissue of the body, which can usually be eliminated by the following methods: 1. You can use the fingertips to push on the bottom of the tendon bag area, pushing hard towards the joint gap. This can be repeated every day to help disperse the cyst until it disappears, along with hot compresses with towels. 2. local puncture and fluid extraction can be performed, but this method usually tends to make the cyst recur. 3. surgery can be performed to completely remove the cyst, which is the most thorough and effective way to treat the cyst. However, during the surgery, it should be noted that since the tendon bag is usually located in the joint area, it is important to avoid damaging the nerves so as not to affect the function of the joint.