Was skinny all my life, finally gained weight after sitting at home for almost two years and was able to pop out this blackhead on my chest. I used to be so skinny that I didn't have loose skin to squeeze it out!
I get this every so often, and it stays for WEEKS if not months, it's sore and weeps often (that's why it looks crusty) doesn't come to a head, and eventually goes away on its own. I look gross because it's so huge