Necrotising fasciitis is a surgical emergency, and anyone with severe pain, rapidly spreading redness and fever should be in an emergency department now rather than reading about timelines. This article is for patients and families past that acute phase. Recovery is long, staged and highly variable, and the honest answer to how long it takes is months rather than weeks. The stages below describe what commonly happens and in what order.
Weeks two to four: from surviving to healing
By this stage the aim shifts from stopping the infection to preparing the wound for closure. If things are going well, trips to the operation theatre become less frequent and then stop, fever settles, blood pressure needs less support, breathing support is reduced and blood tests improve. The open wound is dressed regularly, often with negative pressure dressings that apply gentle suction to manage discharge and encourage healthy red tissue to form across the base.
Antibiotics are narrowed according to culture results and eventually stopped. Nutrition becomes a priority, since rebuilding this much tissue requires a great deal of protein and energy, and many patients have eaten very little for days. Physiotherapy continues, joints are moved and splinted where needed, and patients are helped to sit and then stand as strength allows. Confusion from the acute illness usually clears during this period, though sleep often remains disturbed.
Weeks four to eight: reconstruction
Reconstruction is planned once the infection is fully controlled, the wound base is clean and healthy, and the patient is medically stable enough for a further operation. The method depends on the size, depth and location of the defect and on what lies exposed.
- Split skin grafting is used for large but relatively shallow areas with a healthy base. Skin is taken from a donor site, commonly the thigh, which heals as a superficial wound over a couple of weeks and is often the more uncomfortable of the two areas at first.
- Local flaps move nearby skin and its blood supply into the defect and are useful for smaller areas needing thicker cover.
- Free tissue transfer moves tissue from elsewhere in the body with its blood vessels joined under a microscope, and is used where bone, tendon or joint is exposed and a graft will not hold.
Reconstruction is often staged, so more than one operation is common. After a graft or flap the area is immobilised and elevated, the first inspection is usually delayed several days, and movement or weight bearing is reintroduced on your surgeon's instructions rather than by how you feel.
When can the patient go home?
Discharge usually follows the reconstruction rather than preceding it, and it depends on the wound being stable, pain being controlled with tablets, the patient being able to move safely with whatever help is available at home, and dressings being manageable outside hospital. Some patients go home earlier with district or clinic based dressing arrangements. Before discharge, ask who changes the dressing and how often, what the wound should look like, which changes mean ringing the clinic, what activity is allowed, and when the next review and physiotherapy sessions are. Written instructions are worth requesting.
Months two to four: rehabilitation becomes the main work
Once the wound is closed, function becomes the priority, and this is usually the longest and hardest part. Expect weakness, stiffness and poor stamina after weeks of illness. Physiotherapy is generally daily at first, working on joint movement, muscle strength, balance and walking. Splints or pressure garments may be advised where scarring crosses a joint, since scar tissue tightens as it matures and can pull a joint out of position if it is not stretched and supported.
Grafted and flap skin is fragile in these months. It marks easily, tolerates friction poorly, reacts to sun and often feels numb, tight or oddly sensitive. Daily moisturising is usually advised once the surface is fully healed. Swelling that worsens through the day is common and generally responds to elevation and compression. Where an amputation was needed, this is the period when the stump is shaped and conditioned and prosthetic fitting is discussed with the rehabilitation team.
Four to twelve months: scars, function and normal life
Scars continue to change for a year or more, commonly red, raised and firm at first, then gradually softening and fading, though the final appearance varies widely and no scar disappears. Itching and tightness are common. Some patients need further surgery in this period to release a scar that is restricting a joint, to thin a bulky flap, or to improve the appearance of an area.
Return to work depends on the job and on which part of the body was affected. Desk based work is often resumed well before manual or standing work. Driving, long walking and heavy lifting come back gradually. Your team will advise based on your own progress rather than a fixed calendar.
The emotional side deserves attention too. Many people who survive this illness have gaps in their memory of intensive care, disturbing dreams, low mood or anxiety, and considerable distress about how the area looks. These reactions are common after critical illness and they respond to support. Raise them at review visits rather than assuming they will simply pass.
What slows recovery down?
Common reasons for a longer course include poorly controlled diabetes, smoking, low protein intake, anaemia, poor blood supply to the area, a graft or flap that does not take fully and needs repeating, further infection, and joint stiffness from prolonged immobility. Steroids and some other medicines also slow tissue repair. None of these means recovery cannot happen, but each one is a reason to review the plan with your team rather than wait.
Contact your team promptly if a healed area breaks down, if pain increases, if discharge or smell returns, or if fever develops. Go straight to an emergency department if redness begins spreading rapidly again, the skin turns dusky or black, or the person becomes very unwell, since recurrence of severe infection is once again an emergency.
