Hi thanks for your question.
The irregular shaped lump your having in vaginal wall most probably could be bartholin
cyat.Bartholin glands are normally present in vagina and produce sceration for vaginal lubrication
duration sexual activity.when duct of bartholin gland get blocked due to infection or any other reason result in cyst
formation.Infection in cyst can cause.The other reason could be a boil that is infection of hair follicle.There is nothing to worry consult a physician who may examine you and may prescribe you appropriate treatment.You may need a course of antibiotic.
Hope this answers your question.