Swelling after gynecomastia surgery may take several months to resolve. Factors that contribute to the healing would include the type of surgical procedure, ie. liposuction, ultrasonic or laser assisted liposuction, or direct removal alone or in combination. Typically scar tissue will take up to 6 - 12 months to totally soften and resolve. If you have any concerns about the healing following your surgery, I would recommend returning to your Plastic Surgeon for an assessment.
Scar tissue develops over time and often settles. The swelling will persist for several months but everyone heals differently.