I am 21 and I have a recurring bump on the right side of my labia majora it starts off the same every time. At first its a small bump then within 2-3 days it becomes larger and also becomes painful to touch. It has a red head and feels as though it could be filled with pus. I ve never popped it because it is too painful to touch. It normally goes away in a week. Its a single bump that shows up every couple of months. This problem started about 3 years ago. I have not been sexual active for 3 years and I have been tested since and I was negative for any STD so it shouldn t be sexually related. I can show pictures if that would help. Any idea of what this could be? Is there any way to stop this problem from recurring? Thanks