The most common type of buttock cyst is the sciatic nodule cyst, which is usually caused by the following two reasons: First, it is possible that people who often sit at work, or students who often sit and study, often rub or compress the sciatic nodes and hard benches, stimulating the synovial bursa of the sciatic nodes, leading to the formation of local cysts. Secondly, people who often do strenuous exercises of the buttocks or lower limbs, because the muscles of the buttocks often contract with force, stimulating the local soft tissue or synovial bursa, resulting in local cysts. However, cysts are usually benign and do not need special treatment if they are not large and do not affect work or life. If you want to diagnose, you can perform local ultrasound, which can basically confirm the diagnosis. If it affects work or life, or if there is very obvious pain, surgery can be considered to remove it.