About 30% of vaginal cysts are Müllerian cysts, making them the most common type. Like other vaginal cysts they are usually small, painless, and go unnoticed until a medical exam, says Gleaton.

Vaginal cysts may sound alarming, but they are usually harmless. Here's what a gynaecologist says about causes, symptoms, treatment, and when to see a doctor.

"Chocolate cysts" affect up to 44% of people with endometriosis, causing painful periods, pelvic pain and fertility issues that often require surgical diagnosis and treatment, experts say.