Hello dear Understand your concern.. It may be cebaceous cyst/STDs that is common in vaginal area. Apply warm compression and apply neomycine ointment along with oral antibiotics Following are the other cause of lump in vagina: 1. Blocked hair follicle, skene s duct cyst 2. Blocked sweat gland 3. Fordyce cyst 4. Molluscum contagium 5. Bartholin cyst: rare 6. STDs: gonorrhea, syphilis All this cyst are pain less and harmless generally. Do not pop up , it causes infection and bleeding But if it is very large and associated with pain, dysuria, fever, itching , redness and foul smelling vaginal discharge. Then You should think about STDs and would like to test for STDs and And consult to doctor for drainage and take antibiotics. Also maintain hygiene after sex and urination and keep the area dry. Wash vagina with warm salted water 3-4 times a day. Apply bacitracin/neomycin lotion. Wear loose pure cotton inner wear Change inner wear after work out and sweating. Hope this may help you Best regards Dr. Sagar