Sebaceous cysts are also called sebaceous cysts. Sebaceous cysts causing pain are mainly considered to be related to the enlargement of the tumor and the complication of infection and other factors. 1. Tumor enlargement: the cause of sebaceous cyst is relatively clear, and it is considered to be caused by the blockage of sebaceous gland ducts, secretion can not be discharged in time, and gathered in the local area. In the early stage, the tumor is small and usually does not produce obvious symptoms. If the tumor gradually increases in size, it may cause obvious pain or self-rupture. 2. Complicated infection: sebaceous cysts appear obvious pain, but also to understand whether it is related to complicated infection, for example, the stimulation of inflammation, may cause pain, erosion. Sebaceous cyst complication pain, it is recommended to go to the general surgery or dermatology department of the hospital in a timely manner, if necessary, through surgery to completely remove the cyst, and keep the skin as beautiful as possible.