My auxiliary clearance was just over a month ago and although the seroma drained , I am left with a fairly sizeable hardened area under the scar , it’s very uncomfortable and feels like Iv got a small bock of wood under my arm . Does anyone know if this is normal or have experienced anything similar . I mentioned it in a phone conversation with my breast care nurse and she didn’t seem concerned.
I had the same about a week ago (auxiliary clearance 30th November) following seromas which needed draining regularly. My breast cancer care nurse also not concerned, explaining that as healing contiues, seroma starts to harden like a gel until the body starts to reabsorb it. It should start to reduce/soften as the body absorbs and disposes of it naturally, as mine thankfully now has, but she did say to give it a few days. If it's still hard after 5 days, get back in touch with your breast cancer care nurse.
Good luck 
When you're going through hell, don't stop!
