Incision Opening and Draining 3 Weeks After Tumny Tuck

It is not uncommon for localized fluid collections or necrotic fat to drain to the surface particularly in areas of compormised blood supply, specifically the central portions of the abdominoplasty incision. These generally heal within 3 weeks.  Continue follow up care monitored by your plastic surgeon. Antinbiotics are not always warranted but are commonly used.

It sounds like you had a small stitch abscess. If your doctor gave you antibiotics, he was probably concerned about a local infection. Follow his instructions for care.