There is no limit to the number of times closed injections can be used, depending on the needs of the condition and in the absence of complications, but a typical treatment cycle is 3 times. The main purpose of the closed injection is to provide localized pain relief, and drugs such as lidocaine and hormones (trimethoprim, etc.) are often used. Generally speaking, a treatment cycle is about 3 times, with a minimum interval of one week for the second time. If there are no significant complications (e.g. infections, allergies, complications of long-term hormone use), injections can be given when needed. So for the rest of your life, there is no strict limit to the number of treatments. However, after each treatment is relieved, it is best to wait more than 3~6 months before the next treatment. Sequestration is, in most cases, only a symptomatic treatment program. So it is important to identify the cause of the disease and treat it accordingly.