what is the difference between a dark lump and areal light lump

Hi Anon,

Welcome to EmpowHER and thanks for your question.  Am not sure if you are referring to the fluid drawn from a biopsy. Hope this helps, but if not please give us more information so we can help.

The color of the fluid drawn out of the lump will give some clues about its nature. If the fluid is clear or watery and not bloody, and the lump shrinks as a result of the aspiration, it is most likely a cyst. Sometimes the fluid will be white, yellow-green, brown, or bloody – only in rare cases will this mean that the lump is cancerous. If the needle draws out small bits of tissue and very little fluid, that indicates a solid mass. Those tissue samples should be examined by a pathologist, to determine their nature.

Here's a link that can help.

https://www.empowher.com/media/reference/breast-needle-biopsy-0

Best,

Daisy