Had hematoma drained yesterday. Should I worry that it might come back? My breast is still swollen today (Photo)

and that you had your procedure.  If you had a visible bleeder and it was securely controlled, its very unlikely for anything else to occur.  If there was no bleeder appreciated, we always have some trepidation after closing but I've never seen a recurrence of breast hematoma in my personal experience.  As for some swelling, its normal and the key is that it remains stable and doesn't progressively enlarge as it did with your hematoma.  Remember, you uninvolved breast is now a few days ahead in terms of healing.

I agree with the prior answers regarding hematoma and po swelling. It is often a good idea to place a drain after a hematoma is evacuated and  it doesn't look as though you have a drain.  It would be a good idea to see your doctor as an ultrasound of the breast will easily determine if you have fluid collecting around the implant versus post op swelling.