What are the chances a upper back cyst is malignant?

The chances of an upper back cyst being malignant are very low. Cysts are usually benign, meaning they are non-cancerous, and upper back cysts are no exception. However, it's important to see a doctor if you have a cyst to rule out any potential problems. The doctor may recommend a biopsy to determine the nature of the cyst and whether it is malignant or benign.