Hair transplants and keloids: assessing the risk before surgery

Header image: AI-generated illustration.

How is a keloid different from another scar?

Skin surgery triggers a repair process. In a keloid, excessive scar tissue develops and extends beyond the original wound. The lesion may be firm, raised, darker than the surrounding skin or pink, and sometimes itchy or painful.

A hypertrophic scar stays within the original injury and may become less prominent over time. A keloid tends to persist and can continue growing. These distinctions are not always easy to make yourself, especially when the scalp has recently been operated on.

Redness, crusting or a few bumps after surgery do not automatically mean a keloid is developing. However, a raised area that progressively enlarges should be assessed rather than dismissed as a normal part of hair growth.

Why does the donor area need particular attention?

A hair transplant moves follicular units from a donor region to a thinning or bald area. It creates wounds in both places. Several published reports of post-transplant keloids involve the harvesting sites in the donor area, usually at the back and sides of the scalp.

FUT removes a strip of scalp and closes the wound with stitches. It leaves a linear scar, and the tension across the closure is one of the factors the surgeon needs to manage.

FUE uses small circular instruments called punches to remove individual follicular units. It leaves multiple small, round scars. Their visibility depends on the skin, the harvesting pattern and how short the hair is worn. FUE is not a scar-free procedure.

The two methods create different patterns of wounds. That difference alone does not establish that either is safe for every person with a tendency to form keloids. A concern about abnormal healing cannot be resolved simply by selecting a technique name.

What do published cases after FUE actually show?

A 2017 report describes extensive donor-site keloids in a 30-year-old man. Itching and raised bumps began approximately six weeks after FUE, although early healing had been reported as uncomplicated. A separate keloid was also found on his chest.

A 2020 report describes scalp keloids in a 35-year-old man with no known previous similar lesions. This illustrates how difficult individual scar behaviour can be to predict.

These reports establish that the complication can happen. They cannot calculate your personal risk or provide a reliable comparison between FUE and FUT. The small number of published cases is not an incidence rate: not every complication becomes a journal article, and follow-up differs between reports.

A responsible discussion therefore recognises an infrequently reported but potentially persistent and difficult-to-treat problem. It should not substitute a reassuring percentage drawn from a study that did not reliably measure this specific risk.

Who should discuss abnormal scarring before surgery?

Personal scar history is an important part of assessment. Show the clinician scars from previous operations, burns, piercings, vaccinations or inflammatory skin lesions. Explain whether they enlarged, itched, hurt or required treatment. A family history of keloids is also relevant.

Keloids are more common in some populations with darker skin tones, but they can occur in people of any ancestry. Skin colour alone is neither a diagnosis nor an automatic reason to rule out surgery. Equally, lighter skin or no previous keloids cannot guarantee normal healing.

The consultation should also establish the cause of hair loss and look for scalp disease. An inflamed scalp or active scarring alopecia requires dermatological assessment before transplantation is considered. Persistent bumps at the back of the neck may represent another condition; not every raised lesion in that area is a surgical keloid.

The clinician weighs the history and examination against the expected cosmetic benefit, available donor hair and your priorities. For elective surgery, deciding not to operate can be the appropriate outcome when risk or uncertainty is too great.

Can a test transplant rule out keloids?

Some practitioners offer a small test harvest or limited transplant to observe healing before a larger procedure. This may provide information, but its ability to predict what will happen after a full operation is not firmly established.

The authors of the 2017 case report specifically question the predictive value of test patches. Waiting several months is sometimes proposed as a cautious approach. It is not a validated threshold after which later problems become impossible.

A test also creates an injury and can itself leave a scar. A small area that heals normally does not necessarily reproduce the conditions of hundreds or thousands of extraction sites. A reassuring result cannot provide automatic clearance for surgery. The dermatologist and surgeon should explain what the test might change in your decision and what uncertainty would remain.

Do sapphire blades, DHI or PRP prevent keloids?

None of these labels guarantees healing without keloids.

Sapphire blades are used when creating recipient sites. Their use does not, by itself, change how grafts are harvested from the donor scalp. DHI describes an implantation approach using an instrument that also enters the skin. It therefore does not eliminate wounds.

The case reports cited for post-transplant keloids do not demonstrate that platelet-rich plasma, or PRP, prevents this complication. A proposed benefit for wound healing should not become a claim of proven protection in a person prone to abnormal scarring.

The decision should instead centre on suitability for surgery, previous scar behaviour, careful operative planning and an explanation of residual risk. An additional treatment sold with a package cannot replace that assessment.

What if a scar starts to thicken after a transplant?

Contact the surgical team or a dermatologist if a firm raised area enlarges, itching persists or you develop unusual pain. Dated photographs may help document changes, but they do not replace an examination when the diagnosis is uncertain.

Treatment depends on the lesion and your symptoms. A specialist may consider corticosteroid injections, silicone on healed skin or other treatments. More than one approach may be needed, and improvement and recurrence vary.

Do not put silicone sheeting on an open wound or scab, or improvise a pressure dressing over a fresh transplant. Methods used to manage scars elsewhere on the body cannot automatically be applied to FUE wounds. A clinician should decide which measures are appropriate and when to use them.

Surgically removing a keloid also needs careful planning because another wound can trigger recurrence. Increasing redness, pus, fever or rapidly worsening pain requires assessment for other complications, including infection, rather than an assumption that the problem is simply scar tissue.

Can hair be transplanted into an existing keloid?

Camouflaging an old scar and preventing a new keloid are separate issues. Some stable scars can be assessed for hair restoration. An enlarging keloid should not be treated as an ordinary flat scar: further punctures may provoke additional abnormal healing.

The lesion needs dermatological assessment and, where appropriate, treatment before a cosmetic camouflage plan. If transplantation is unsuitable, discuss options that fit your diagnosis and preferences, including approaches that do not create new skin injuries. Scalp micropigmentation uses needles and should not automatically be considered free of scarring risk.

If you are considering treatment abroad, allow time for this assessment before booking an operation. Send clear photographs of previous scars and details of any treatments, but recognise that the clinician may need an in-person examination. Agree who will review a changing scar after you return home; the first few postoperative days cannot settle every longer-term healing question.

Body Expert is a medical tourism agency working with partner clinics. It can help coordinate communication and practical arrangements, while the medical team determines whether surgery is appropriate. Ask for an explicit assessment of your scar history and the remaining uncertainties, rather than a promise that a technique or test will remove the risk.

Sources

• Alhamzawi, N. K. (2020). Keloid scars arising after follicular unit extraction hair transplantation. Journal of Cutaneous and Aesthetic Surgery, 13(3), 237–239.
• Garg, S., Kumar, A., Tuknayat, A., & Thami, G. P. (2017). Extensive donor site keloids in follicular unit extraction hair transplantation. International Journal of Trichology, 9(3), 127–129.
• American Academy of Dermatology Association. (2022). Keloid scars: Overview.
• American Academy of Dermatology Association. (2023). Keloid scars: Diagnosis and treatment.