I have this lump about the size of a 2 pence piece at the top of my vagina. Its red with a black head on it. I did try and pop it when i first found it and i think thats why it turned black on the head. I tryed to pop it again today but i couldnt and when i did a tiny bit of blood came out. Its really hard and raised. All around it is red and has like tiny white bumps around it. What could this be? please help.