What Do Knots In Ear Lob On Back Side Indicate?

I have knots in my ear lob; back side. They hurt like a pimple does, but these are averaged sizes of a pencile eraser. They feel hot & hurt from time to time that I squeese thwm & I can hear some of them make a crunching sound, & leak watery sustance. One that felt like it was on fire & every large(size of a marble), hot goowey (yellowish w/ watery-blood) came out. That one healed quickly after that, but left a large indention there. Why do I get these , what are they, & whats the best way to not get them/ get rid of them ?