I had a healed pimple on my face from 2 weeks ago. It had a tiny scab left and the area felt hard as a rock. Being the picker I am, I gave it a small squeeze and Bam! This surprise squirted out. I was impressed.
I know this was a perfect storm, but if you have a blackhead on a stretch mark in a belly fold, probably don’t poke around and pop it with not the cleanest hands. This doesn’t feel good!