Hi Eileen,
After my mastectomy the area especially around the scar did feel very bumpy and some of these bumps were probably just the scar tissue hardening. I think the more we massage the area the better both for moving the fluid and for softening the scar tissue.
I know my surgeon told me that most of my hard areas would continue to soften for a year or more. If you are at all worried then ask someone from your medical team about it (breast care nurse or physio would be able to help I'm sure).
Almost 3 years since my mastectomy and most of those bumps and lumps are soft now, but a massage to keep the fluid moving is still something I do once a week or if it feels like I need to. Hope your surgery on the 9th goes well. Take care.
Deanne xxx