Thank you for your question as it is an important one after any kind of #PlasticSurgery procedure. A certain amount of swelling is expected for the first 1-2 weeks post-surgery. Most of us use #Tumescence liposuction as part of the treatment of #gynecomastia. It is not uncommon for the surgeon to infiltrate several hundreds of milliliters of fluid prior to liposuction and excision of the excess glands. It is also common to inject some longer-lasting local anesthetics. Finally, there are also different techniques for gynecomastia surgery and therefore different amount of possible swelling post-op: gynecomastia surgery can include liposuction alone – (and the type of liposuction machine used can also dictate the amount of swelling) - excision of gland alone, lifting of nipple and areola in severe gynecomastia, combination of different procedures, etc. Bleeding is an important cause of immediate post-op swelling and should be ruled out first. If you had surgery just one hour ago, ask your surgeon to have a look - or his/her nurse if the surgeon is in surgery. A hematoma would typically only occur on one side. Did you surgeon use drains? Drains are sometimes left in place for a few days to collect all post-op fluids. Hematoma may require going back to surgery. I also commonly use a compression vest garment on my #Toronto patients after gynecomastia surgery to help maintaining a slight compression. Hope this helps! Best, #DrMarcDuPere, Toronto board-certified Plastic Surgeon