Help draining seroma during rads

wiskris

II had a lumpectomey on 3/13 and developed a large seroma soon after. My BS and RO both said it will take care of it self. Well I am at #10 of 33 treatments and it has gotten way larger and painful. MY Ro did a cat scan and it is HUGE! Now my RO wants me to talk to BS on Tuesday(prescheduled appt) to drain it! I would think this would throw out my alignment in rads? I don't want to risk anything by changing size of breast during rads....I know they Rad from middle of chest to armpit. Will this affect it in anyway??? RO says it wont but I'm too scared! I am this far already!! I am willing to live with pain till after rads is complete.  I have started wearing more compression type bras and it has not helped yet!!!

Please help