Dr. Lee defines a cyst as "a benign growth commonly found in the skin that typically appears on the face, neck, chest, or back, but can occur anywhere on the body." What differentiates a cyst from a microscopic blackhead or a squishy lipoma is the contents: a free-floating sack of wet skin cells, which creates a cottage cheese-like consistency. Cysts are often accompanied by some sort of odour — which smells exactly like what you would imagine a collection of festering moist skin cells to smell like upon hitting the air.