What could a small hard bump on occipital ridge behind the left ear be It is not painful or discolored There one right side?

A small, hard bump on the occipital ridge behind the left ear that is not painful or discolored could be a number of things. Some possibilities include:

* A lipoma: Lipomas are benign tumors made of fat cells. They are usually soft and movable, and they can occur anywhere on the body.

* A cyst: Cysts are sacs filled with fluid or other material. They can occur anywhere on the body, and they are usually not harmful.

* An osteoma: Osteomas are benign tumors made of bone. They are usually hard and immovable, and they can occur anywhere on the body.

* A lymph node: Lymph nodes are small, bean-shaped organs that are part of the lymphatic system. They help to filter out bacteria and other foreign particles from the body. Lymph nodes can become swollen when they are fighting an infection or when they are cancerous.

If you are concerned about the bump, it is best to see a doctor to get a diagnosis. The doctor may recommend imaging tests, such as an X-ray or MRI, to get a better look at the bump and determine what it is.