A benign tumor is a mass of cells (tumor) that lacks the ability to invade neighboring tissue or metastasize. These characteristics are required for a tumor to be defined as cancerous and therefore benign tumors are non-cancerous.
Cysts are closed sac-like or capsule structures that may be filled with semisolid material, gaseous material, or liquid. There are several causes of cysts, including genetic, infectious, and other causes that result in hundreds of types of cysts. Risk factors for developing a cyst are related to the underlying causes of the cyst formation.
Most cysts are asymptomatic and have no signs. However, some cysts on the skin, mucous membranes, and those located in palpable organs often can be felt as a lump or bump; sometimes they are painful.