These cysts are closed sacs that can be found under the skin
The term “sebaceous cyst” refers to either an epidermoid cyst, which originates from the skin or a pilar cyst, which comes from hair follicles. Sebaceous cysts may be caused by blocked glands or swollen hair follicles in the skin. In some cases, however, cysts can get inflamed and become tender to the touch.
The skin on the area of the cyst may be red and/or warm. Sebaceous cysts can become infected. If the cyst ruptures, it can lead to a boil-like infection, and you will need treatment right away. In most cases, however, no complications or side effects occur after treatment to drain or remove the cysts surgically under local anaesthetic using the antiseptic technique.