What are three small bumps on the back of your head that have been there two months which hurt and they feel like bone you do not lymphoma?

1. Sebaceous cysts. These are small, benign growths that develop from the sebaceous glands in your skin. They are typically round or oval, and they can range in size from a few millimeters to a few centimeters. Sebaceous cysts are often filled with a white or yellow material, and they can sometimes be tender to the touch.

2. Lipoma. These are also benign growths that develop from fat cells. They are typically soft and doughy to the touch, and they can move around when you press on them. Lipomas can range in size from a few millimeters to several centimeters.

3. Osteoma. These are benign growths that develop from bone tissue. They are typically hard and immovable, and they can range in size from a few millimeters to several centimeters. Osteomas are often found on the skull, but they can also occur on other bones in the body.

If you are concerned about the bumps on your head, it is important to see a doctor to get a proper diagnosis. The doctor will be able to determine what is causing the bumps and recommend the best course of treatment.