Bartholin's glands are a part of the vulva anatomy. There are located in either end of the vaginal opening to provide lubrication to the vulva and the vagina at the time of intercourse. Sometimes these glands get blocked and the fluid collects inside the gland which forms a cyst which is a bulge on the labia. The cyst is treatable and your health cafe provider can help you with that.
Sources:
https://www.mayoclinic.org/diseases-conditions/bartholin-cyst/symptoms-causes/syc-20369976
https://www.ncbi.nlm.nih.gov/books/NBK557803/
https://familydoctor.org/condition/bartholins-gland-cyst/
https://my.clevelandclinic.org/health/diseases/17737-bartholin-cyst