Is it possible to have seroma 1 month post-op, and is it ok to leave alone or does it have to be drained?

You can develop a seroma one month post op.  I encourage you to contact your surgeon for an appointment.  An examination is needed to determine the cause of the swelling, and if there is fluid build up, how it should be treated.  Aspiration can be done in the office in most cases.

Thank you for your question.Yes it is best to have it drained or at least see your plastic surgeon.  Could be a seroma, could be a small hematoma (bleeding) brought in by exercising.  Undrained hematomas or seromas can "organize" themselves with scarring tissues over time and you might be left with a larger breast.  Also, leaving the capsule in place makes this a bit more likely.Hope this helps!Dr. Marc DuPere, aesthetic plastic surgeon

You should definitely schedule a follow up with your physician to assess why you feel the firmness you describe.    If you do in fact have a serum, it would be prudent to drain it.    First, because any fluid left may hinder the your breast from contracting a bit, and two, the fluid may increase your risk of an infection.  If there is fluid, it is very simple to drain.