What could a mass on the left side of your back its been there for couple years it is hard about size dime?

There are a few possible causes for a hard, dime-sized mass on the left side of your back that has been there for a couple of years. Some of the most likely causes include:

* Lipoma: Lipomas are benign tumors that are made up of fat cells. They are typically soft and movable, but can sometimes be firm. Lipomas can occur anywhere on the body, but they are most common on the back, neck, and shoulders.

* Cyst: Cysts are sacs filled with fluid or other material. They can occur anywhere on the body, and can be caused by a variety of factors, such as infection, trauma, or a blocked duct.

* Fibroma: Fibromas are benign tumors that are made up of fibrous tissue. They are typically hard and immovable, and can occur anywhere on the body.

* Keloid scar: Keloid scars are scars that are larger and thicker than the original wound. They are often itchy and painful, and can occur anywhere on the body.

* Skin cancer: Skin cancer can sometimes present as a hard, dime-sized mass. It is important to see a doctor if you have any concerns about a mass on your skin.

If you have a hard mass on the left side of your back that has been there for a couple of years, it is important to see a doctor to get it checked out. Your doctor will be able to determine the cause of the mass and recommend the best course of treatment.