Dark circle: Benign cysts appear as dark black spheres, a cancerous lump would be bright white and solid.
Answered 4/17/2019
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Entirely black: With a smooth outline with increased sound transmission which shows up as white behind the back wall of the cyst. It does not contain any blood flow. A cancerous lump is usually irregular and gray inside and may show blood flow within it.
Answered 4/17/2019
4.6k views
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