1 Large or ruptured ovarian cysts can cause symptoms including pain, pelvic pressure or discomfort. 2  Vaginal (pelvic) ultrasound can be used to reveal the presence of ovarian cysts.  Ovarian cysts can vary in size. Many are very small, while cysts associated with ovarian tumors may be 12 inches or more in diameter.
http://www.emedicinehealth.com/ovarian_cysts/article_em.htm
Functional ovarian cysts form due to a minor problem in the menstrual cycle. They affect girls and women who have not been through the menopause, and are very common. Each month, a woman's ovaries release an egg, which travels down the fallopian tubes into the womb (uterus), where it can be fertilised by a man's sperm.
http://www.nhs.uk/Conditions/Ovarian-cyst/Pages/Causes.aspx
1 Many ovarian cysts produce no symptoms. Large or ruptured ovarian cysts can cause symptoms including pain, pelvic pressure or discomfort. 2  Vaginal (pelvic) ultrasound can be used to reveal the presence of ovarian cysts.  Ovarian cysts can vary in size.
http://www.emedicinehealth.com/ovarian_cysts/article_em.htm
1 Symptoms of ovarian cysts depend to a large extent on the size of the cyst. Many ovarian cysts produce no symptoms. Large or ruptured ovarian cysts can cause symptoms including pain, pelvic pressure or discomfort.  Vaginal (pelvic) ultrasound can be used to reveal the presence of ovarian cysts.
http://www.emedicinehealth.com/ovarian_cysts/article_em.htm
There are a number skin conditions that cause lumps and bumps to appear on the surface or just below the skin. Skin Cysts. Cysts are noncancerous, closed pockets of tissue that can be filled with fluid, pus, or other material. Cysts are common on the skin and can appear anywhere. They feel like large peas under the surface of the skin. Cysts can develop as a result of infection, clogging of sebaceous glands (oil glands), or around foreign bodies, such as earrings.
http://www.webmd.com/skin-problems-and-treatments/guide/cysts-lumps-bumps
1 Ovarian cysts are fairly common. They are fluid-filled sacs that form in or on a woman's ovaries.  Symptoms of ovarian cysts depend to a large extent on the size of the cyst. Many ovarian cysts produce no symptoms. Large or ruptured ovarian cysts can cause symptoms including pain, pelvic pressure or discomfort.
http://www.emedicinehealth.com/ovarian_cysts/article_em.htm
Most cysts do not disappear on their own without treatment. Some cysts may need to be drained to relieve symptoms. That involves piercing the cyst with a scalpel and draining it. That doesn't cure the cyst, however. Some inflamed cysts can be treated with an injection of cortisone medication to cause it to shrink.
http://www.webmd.com/skin-problems-and-treatments/guide/cysts-lumps-bumps
Polycystic ovary syndrome (PCOS) is a condition that causes lots of small, harmless cysts to develop on your ovaries. The cysts are small egg follicles that do not grow to ovulation and are the result of altered hormone levels. Page last reviewed: 09/12/2014.
http://www.nhs.uk/Conditions/Ovarian-cyst/Pages/Causes.aspx
Conditions that cause ovarian cysts. In some cases, ovarian cysts are caused by certain conditions, such as endometriosis. Endometriosis occurs when pieces of the tissue that line the womb (endometrium) are found outside the womb in the fallopian tubes, ovaries, bladder, bowel, vagina or rectum. Blood-filled cysts can sometimes form in this tissue.
http://www.nhs.uk/Conditions/Ovarian-cyst/Pages/Causes.aspx
1 Very rarely, cysts on the ovaries are part of ovarian cancers. Benign functional ovarian cysts do not cause cancer, and the vast majority of ovarian cysts are benign.  Some types of ovarian cysts (polycystic ovary syndrome and cysts related to endometriosis) may make it more difficult for a woman to get pregnant.
http://www.emedicinehealth.com/ovarian_cysts/article_em.htm
cause of ovarian cyst
Endometriosis is the cause of an ovarian cyst.    Endometriosis is a cause of ovarian cyst. 