Tumors

An abnormal mass of tissue that forms when cells grow and divide more than they should or do not die when they should. Tumors may be benign (not cancer) or malignant (cancer). Benign tumors may grow large but do not spread into, or invade, nearby tissues or other parts of the body.

Lipomas

Lipomas are harmless, fatty lumps. They are benign, meaning they are not cancerous, and are quite common. Lipomas can appear anywhere where you have fat cells and most commonly grow on the neck, chest, back, shoulders, arms and thighs. Sometimes lipomas grow inside the body, and you may not be aware they are there.

lumps

Most lumps and swellings are benign (not cancerous) and are harmless, especially the kind that feel soft and roll easily under the fingers (such as lipomas and cysts). A lump or swelling that appears suddenly (over 24 to 48 hours) and is painful is usually caused by an injury or an infection.

cyst

A cyst is a sac-like pocket of membranous tissue that contains fluid, air, or other substances. Cysts can grow almost anywhere in your body or under your skin. There are many types of cysts. Most cysts are benign or noncancerous.