Swelling after gynecomastia surgery - 1 month post-op. (photos)

You may have developed a seroma, which is a collection of tissue fluid that may need draining off with a needle and syringe. Otherwise you still have some breast tissue remaining, and some redundant skin. However if you say the swelling is getting worse then it sounds like a seroma.

Dear APenguin,swelling is a common issue after gynecomastia surgery. It usually subsides without any consequences. However, you should inform your plastic surgeon.Daniel Barrett, MD, MHA, MS 
Certified, American Board of Plastic Surgery 
Member, Am. Society of Plastic Surgery

Thank you for sharing your question and photographs and I see your area of concern.  After removal of a compression garment the body's tissues can swell as your activity level increases after surgery.  This swelling should resolve spontaneously as your results continue to mature.  You should inform your surgeon of this development to rule out any possibility of fluid collection and he may ask that you continue to use your binder for a longer period of time for your own comfort and to encourage skin shrinkage.  Hope this helps.