Bad first. ....
It feels a little hard. It's sebaceous adenoma, and it smells bad. Most of the reasons are that oily skin sometimes leads to sebaceous gland inflammation after ear washing, and sweat oil can not be metabolized, leading to cysts. The chance of canceration is equal to zero, but if it is to be eradicated by surgery, the skin behind the ear is too thin to be anesthetized, and the operation is quite painful.
What's the good news? ...
Aren't you lucky to have a sebaceous cyst on your face? You can wash it with soap regularly every day, and it is possible to go down.