I have a cyst behind my ear it's not too painful, but should I see a doctor to drain it?

It's best to go to your Family Physician and get it checked out. In most cases, lumps or nodules behind the ears are harmless. They may signal a need for medication, as in the case of an infection, but rarely are they a sign of a dangerous or life-threatening problem. If you know it's a Cyst, than odds are it is a Sebaceous cyst. Sebaceous Cysts are noncancerous bumps that arise beneath the skin. They most commonly develop on the head, neck, and torso. This type of cyst develops around the sebaceous gland, which is responsible for producing oil that lubricates your skin and hair. Most sebaceous cysts cause little to no pain. They may, however, be uncomfortable or irritating because of where they develop on your body.

It might go away on it's own, but if gets any bigger or down not go away then you should see doctor.