What Are the Common Causes of a Perineum Lump in Females, and How Are They Diagnosed?

A lump in the perineum—the area between the vagina and the anus—can be due to several different causes. One common cause is an epidermoid cyst, which is a small, benign pocket filled with skin cells. This type of cyst is not usually dangerous but can be uncomfortable if it grows or becomes irritated. Another possibility is endometriosis in the perineum. In this condition, cells similar to those that line the uterus grow in this area, causing pain, especially during periods. In rare cases, the lump might be a soft-tissue tumor, such as a myoma (a type of benign growth). To find out what is causing the lump, a healthcare provider will start with a careful physical exam. They may also use imaging tests like an ultrasound or an MRI to see the lump more clearly. In some situations, a small sample of tissue (a biopsy) is taken to study it under a microscope. These steps help the doctor decide on the best treatment plan, which might include monitoring the lump or removing it if needed.