Lipomas: Soft tissue tumors made up of fat cells, often found under the skin. Fibromas: Composed of fibrous or connective tissue, these tumors often occur in the ovaries or uterus. Adenomas: Formed in glandular tissues, commonly occurring in the thyroid, colon, or adrenal glands. Nevi: Commonly known as moles, these are growths on the skin that are usually harmless.