I am a 18 year old female. I have a bulb like protrusion at the mouth of my anus. It's senseless except for itching around it sometimes. I have it since I was a kid but it was very small. It is growing in size. A few days back a similar small protrusion emerged in the same area. I want to know what it it and what are the possible reasons that it emerged? Is it something to worry about?