For simple procedures with minimal dissection (trimming out a piece of cartilage, placing a small graft in a precise pocket, performing closed osteotomies of the nasal bones) the swelling is greatest at 1-2 weeks and then slowly improves over the next month or two. In those cases where the nose is opened and a wide dissection is performed of the skin envelope, the swelling can persist for months and longer. Part of it is the bodies natural response to injury. The cascade of inflammation to proliferation of healing tissue to scar tissue formation can take up a year to occur. The nose tends to hold onto water and build up scar tissue after surgery. The maturation of scars has been well studied and is known to occur throughout the first year of healing as the tissues remodel and scars contract. This is most readily observed with anyone who has had a scar on their knee. The heaped up red scar slowly over the course of several months flattens and loses its vascularity as the blood supply that helped the initial healing tissue is no longer required and the muscle like cells of the scar contract making it smaller. Sometimes it takes 2 months for the scar to fade but more often it persists for up to a year. Disrupting the skin/soft tissue envelope in open rhinoplasty tends to exacerbate this swelling by interfering with the drainage of the excess fluid that leak out between the cells. Every injury causes some amount of swelling, and the body naturally helps drains this extra fluid through the lymphatics. The lymphatics run through the body like blood vessels but do not regrow as rapidly as blood vessels. When they are disrupted, the fluid is trapped in the nose and the swelling persists for a longer time.