This sounds like it could be bartholin cyst around the vagina. Try sitting in warm water. Add some salt to it. Make sure the water isn't boiling hot! Sit in it for a good 25 minutes. Make sure that when you shower you have no contact with the bathtub floor because that has many germs. Wash your vagina every day and do not use anything but pure water to clean yourself. Also try damp warm cloths and place it around the area where you have them. DO NOT POP THEM! It will cause an infection and often they would end up draining them!
First off, don't pop them, this can cause infection.
They sound to me like inverted hair follicles, they can cause the issues you are describing. If they continue, see your doctor.
Sounds like they could be just an infected poor or hair follicle. They happen sometimes when you gain weight due to pregnancy or otherwise and clothing doesn't fit the way it used to sometimes rubbing the area and causing irritation and sweat and bacteria are introduced creating the bumps.