If the bruise has an underlying collection of blood clots, then this might show up on the mammogram, but this is rather an exception rather than the rule. Blood is really not that radio-opaque, meaning, they won't really show up on the film. Uncommonly, a bruise may be an initial manifestation of more serious conditions underneath the breast, especially if long standing. The bruise should heal within the next 5-7 days and if this does not, I suggest that you show this to your doctor for evaluation.
i've had a huge breast abcess that burst and drained itself as i was on antibiotics then i had a second bruise which also leaked and that meant back to hospital then i had incise and drainage between the two wounds...now i have a new soft bruise lump and worried as it might be another abcess.
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