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
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!