Saroma: how long before one disappears following surgery for a hernia?

Depends: Seroma is a fluid collection in the empty space where the hernia had been located. Seromas resolve over days or weeks. Depends on where the hernia was located and how large the hernia was, with larger hernias taking longer to heal. These fluid collections generally resolve on their own without additional intervention.

Weeks to months: A seroma is the fluid trapped by the repair that is "secreted" by the damaged tissue from the surgery. It will go away. I always tell my patients not to have someone drain it as they could get infected and that would be worse. Give it time and it will get better.

Weeks to months: There is a variety of hernia repair techniques, thus a variety of places you could get a seroma, or fluid collection. These places include under the skin, around a mesh, or even in the abdominal wall. They usually resolve without treatment in 3 weeks to 3 months. If its not causing a major problem, observation. If causing a problem, may need drainage.