I have an enlarged lymph node under my left ear could this be a cyst? and why did it just randomly pop up? how can i make it go away?

Facial mass: Masses of the head and neck need to be checked out by your primary care doctor. This could be anything from a lymph node to a parotid gland mass to a infected cyst. Without a proper history and physical from your doctor, there is no way to know exactly what it is. Go see your physician.

Get it checked: Difficult to say why anything like that "pops up" with no reason. There are typically causes of these types of things, and a review of the history with your doctor can help reveal the cause and the solution to the problem. See a doctor soon.