Hello, my little sister has these strange bumps all over her butt and inner thighs(more near her genitals) that look like pimples. she's had them for over 6 months and they won't go away. some are big and some small. they don't have puss in them but they do bleed when popped. We popped a really large one and it bleed a lot but what also happened was the top part that looked like a white head pimple popped out and created a skin tag. what is this? is it like genital warts or ingrown skin tags? not all do that though.