Final answer:
A lipoma is a benign tumor composed of adipose tissue that does not have the potential to spread like malignant tumors. It can be found anywhere on the body where there is fat and is usually harmless and painless.
Step-by-step explanation:
The medical term that means fatty substance/tumor growth is called lipoma. A lipoma is a benign tumor composed of adipose tissue, which is a type of connective tissue made up of fat-storage cells called adipocytes. Lipomas are usually found just beneath the skin and feel soft and doughy to the touch. They can occur anywhere on the body where there is fat, but are most commonly found on the neck, shoulders, back, and arms.
Lipomas are typically harmless and painless, and most people choose to leave them alone unless they become bothersome or cosmetically undesirable. If a lipoma does need to be removed, it can usually be done through a simple surgical procedure.
It's important to note that lipomas are different from malignant tumors or cancers. They do not have the potential to spread to other parts of the body like malignant tumors do.