Hair transplant risks and complications, and how each one is prevented

A hair transplant is surgery, so the honest answer about hair transplant risks is that there are several, most of them small and short lived, and a few that decide whether you are happy in a year. Swelling, scabs, itching and patches of numbness happen to most patients and settle inside two weeks. Infection, poor growth, a donor area taken too hard and a hairline planned badly are the ones worth reading slowly, because those four are mostly the product of decisions made in the clinic rather than bad luck. This page lists each risk, what Ego Hair Clinic does to reduce it, and what happens if it occurs anyway.

The effects almost everyone gets

These are not complications. They are the normal course of the operation and you should expect them.

Swelling arrives on day two or three, usually across the forehead and sometimes around the eyes, and is gone by the end of the first week. Small scabs form over every implanted graft and every extraction point; they lift by day 10 to 14 once you are washing properly. The recipient area stays pink for two to six weeks, longer on pale skin. Patches of the scalp feel numb or feel like a bruise, most often at the back, and sensation comes back gradually. Itching starts as the scabs dry and is a healing sign, not an allergy. None of this stops you flying home on day three.

Infection and folliculitis

True infection after a hair transplant is uncommon, because the scalp has an unusually good blood supply. It becomes more likely when the operating environment is not sterile, when hundreds of patients pass through the same rooms in a day, or when a patient cannot resist scratching.

Folliculitis, which looks like small white-headed spots in the recipient area around week three to eight, is more common than infection and usually settles with warm compresses and the cream you are told to use. In either case you photograph it and send it, and you are answered. Do not wait to be seen in person: a photograph on day two of a problem is worth more than a consultation on day ten.

Poor growth: the hair transplant risk that matters most

Everything else heals. Poor growth is the one that leaves you where you started, minus the money and the donor hair.

Grafts fail for reasons that are inside the clinic’s control and reasons that are not. Inside: how long grafts sit outside the body, how they are held, how much force the implanting instrument applies, and whether the recipient area was packed more densely than its blood supply can feed. Outside: smoking, uncontrolled diabetes, an unrecognised scalp condition, and a patient who does not follow the first two weeks. This is why the sessions here are sized to what one team can implant carefully in one day and why the density plan is conservative over the crown, where blood supply is poorest.

Judge growth at month 12, not earlier. Transplanted hairs shed between weeks two and six, growth starts at month three or four, and half to two thirds of the density is visible at month six.

Taking too much from the donor area

The back and sides hold a finite number of grafts and they do not regenerate. A donor area harvested too aggressively looks thin, moth-eaten or shiny under strong light, and no procedure fully restores it. It is the most common serious complication of the high-volume model, where a large graft number is the thing being sold.

Safe harvest in one session is typically 2,000 to 4,000 grafts, depending on your measured donor density, not on what you want. That is why the analysis puts a number on your donor before it puts a number on the recipient area, and why the largest sessions here are 4,500 grafts. If your pattern needs more than the donor can give, the answer is a plan across two sessions or a smaller area covered well. The donor area guide explains how the measurement is done.

An unnatural result is a planning failure

A detectable transplant is almost always a design decision: a hairline set too low for the face, a straight line instead of an irregular one, multi-hair grafts placed at the very front, or density built in the wrong zone for the age the patient will be at 50. None of that is a surgical accident and none of it is fixed by a better instrument.

Prevention is boring and it works: single-hair grafts at the front edge, an irregular transition, a hairline drawn for the loss you are likely to have in twenty years, and the temples left in proportion. If you arrive with a previous result that was designed badly, the repair and revision page explains what can be redistributed, what can be camouflaged and what has to be lived with.

Rare but serious

Skin necrosis, where a patch of scalp loses its blood supply and the tissue dies, is rare and is linked to recipient areas packed too densely, to heavy smoking, to previous surgery in the same zone and to diabetes that is not controlled. It leaves a scar. The prevention is the same conservative density planning described above, plus refusing to operate when the risk is stacked.

Shock loss of your own hair around the transplanted zone is common enough to expect rather than fear, and it usually regrows.

What raises your own risk

Smoking is the single item you control that changes outcomes most, because it narrows the small vessels that have to feed every graft. Uncontrolled diabetes, an active scalp condition such as severe seborrhoeic dermatitis, and unstable hair loss at a young age all argue for treating first and operating later. Blood thinners, some supplements and alcohol in the week before surgery all increase bleeding. Whether you are a candidate at all is a separate question with its own page: read am I a candidate before you read prices.

FAQ

How common are complications after a hair transplant?

The minor effects are near universal: swelling, scabs, temporary numbness, itching and redness. Real complications are uncommon, and most of what goes wrong is not a dramatic event but a quiet one, an area that grows thinly or a donor zone taken too hard. That is why the questions to ask a clinic are about graft numbers, who performs which step and density planning rather than about emergencies. Your own answer depends on your donor density, your health and whether your loss is stable.

Can an infection after a hair transplant ruin the result?

An infection treated in its first days rarely costs you grafts. One left for a week can. The scalp’s blood supply makes serious infection unusual, and the practical protection is a sterile theatre, medication you actually take, hands kept off the scabs, and a clinic that answers a photograph. If you notice spreading redness, heat, yellow discharge, pain that increases rather than decreases, or a fever, send a photograph immediately and see a doctor where you are if you cannot travel.

Will the transplanted hair fall out again?

The transplanted hairs shed in the first weeks, which alarms people who were not warned, and regrow from month three or four. Once grown, transplanted follicles are taken from the back and sides, which are much less sensitive to the hormone that causes pattern loss, so they keep growing. The hair that was never transplanted can still thin, which is why medication is discussed and why a plan looks twenty years ahead rather than at month twelve.

Does a hair transplant leave scars?

Every extraction point leaves a tiny round scar in the donor area. With a 0.7 to 0.9 mm punch and extraction spread across a wide zone, these are not visible at normal hair lengths and become noticeable only if you shave to grade one, or if too many grafts were taken from too small an area. Older harvesting methods that removed a band of skin leave a single long line instead. Ask to see donor photographs at month 12, not day 10.

What if I have a complication after I have flown home?

You photograph it and send it, and you are answered on WhatsApp. Most questions in the first month are about scabs, spots, redness and swelling, and are resolved with a photograph and a change to your washing routine. If you need to be examined or need a prescription where you live, you see your GP or a dermatologist at home and the clinic sends them your operative details. Follow-up runs for 12 months either way.

Clinically reviewed by the treating surgeon. Last reviewed 25 September 2026.