I had a left mastectomy and aux clearance almost 8 weeks ago and have a seroma near my pec muscle. I have being seeing a lymphatic physio for several weeks and have found her to be an amazing help. Not only does she do lymphatic massage and help with any cording that has flared up along the way ( none now at all ) she has also started massaging my scar to help that heal and desensitise. All my specialists want the seroma to disappear on it's own, surgeon, breast care nurse, oncologist and GP. Other than being slightly annoying and uncomfortable at times, especially at the end of the day it causes me no issues. In saying that I can't wait for it to disappear completely, it is slowly getting smaller each week now though.