I have had this pimple like thing on the middle of my back for over half a year, it a bit red, but it also pops like a pimple if put on enough pressure. Hard stringy white stuff comes out, but only my sister can get it to pop. Anyone else couldn't get it. What worrys me is that we've pop it like 6 times. And it still there. If I don't get it pop it gets bigger. I would assume it was a bug bite, but come on over 6 months of this? And when I pop pimples on my body they go away. But this one won't. Anyone can help me?