The most common type of buttock cyst is sciatica nodule cyst, which is usually caused by the following two reasons: First, it may be the people who often sit down to work, or students often sit down to study, the sciatica nodule often friction with the hard bench or pressure, stimulate the synovial bursa of the sciatica nodule, resulting in the formation of localized cysts. Secondly, people who often do strenuous exercise 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 localized cysts. However, cysts are usually benign swellings, if they are not very large and do not affect work and life, they do not need special treatment. If you want to diagnose, you can perform a local ultrasound, which can basically confirm the diagnosis. If it affects your work or life, or if there is obvious pain, you can consider surgery to remove it.