Hi @Jinni I can definitely say that massage works for the breast and armpit lymphedema and mine is worse in summer the arm and hand are minimal now. My physio gave me some great tips in the very beginning especially regarding massage and the need to get my arm up and wriggle my fingers to get gravity to help I avoided the sleeve thankfully
with the breast as i have a full size difference since the breast conserving surgery to remove my tumour. You cant buy a bra with 2 different size cups. Haha just got to fill the gap so my breast doesn’t have room to swell into there are specialist massage therapist that do lymph drainage massage. Just that I live in Sydney in the base of the blue mts
if you have a breast care nurse she should be able to point you in the right direction in your area
best of luck getting on top of it there is help out there for lymphedema