Cobblestoning, Pitting and Repair: When a Transplant Looks Wrong

Bumpy. Pitted. In rows. Like a doll’s head. Those are the words people use when a transplant looks wrong, and each one points at a different cause — some of them healing, some of them placement, one of them planning. This page is what each word means, when it is worth waiting, and what repair can and cannot do.

First: most bumps are not cobblestoning

In the first months, a bump at a graft site is far more likely to be a healing event than a badly placed graft. Three of them have been counted.

Pustules. In a retrospective comparison of 27 patients who developed recipient-area folliculitis after follicular unit transplantation and 28 who did not, lesion onset ranged from 2 days to 6 months after surgery with a mean of 1.44 months; lesions were mostly pustules, healed without scarring regardless of management, did not affect graft growth, and were not associated with patient characteristics or the number of grafts.^[1]

Redness that stays. In a multicentre retrospective cohort of 1,090 hair transplant patients, persistent redness around the grafts was mild in 16.33 percent, moderate in 5.14 percent and severe in 0.92 percent; patients with it shed more hair shafts and had lower graft survival, folliculitis was a significant risk factor with an odds ratio of 6.061 for mild redness, and an untimely first postoperative wash was associated with the moderate and severe forms.^[2]

Read the second one for what it implies: persistent redness around the grafts is not only a look, it travelled with lower graft survival, and the two things associated with it were folliculitis and getting the first wash wrong. That is the strongest published argument for the wash schedule on our aftercare page.

Hair that grows in wrong. In 980 women who had hairline-lowering surgery, transplanted hair grew back kinky or severely curly in 38, or 3.9 percent; in 36 of them the curl appeared around four months after surgery, and in two it appeared at six to eight months when growth was obstructed by existing hair.^[3]

Those were straight-haired women whose grafts came back curly; the point for a coiled-hair reader is the general one, that transplanted hair can grow in a texture you did not expect, and that the change shows at about four months, which is exactly when a result looks its most uneven anyway.

What an unnatural result is actually made of

A current review of complications in follicular unit excision describes unnatural results as one of the most frequent aesthetic complications and a major cause of dissatisfaction, states that the primary cause is iatrogenic, most often inadequate preoperative planning or lack of surgical experience, and lists improper hairline design, inaccurate graft angulation, direction or height, irregular density distribution, and large multi-hair grafts in the frontal region producing a pluggy or tufted appearance; it adds that careful graft handling and depth control minimise pitting or elevation.^[4]

Take the last clause first, because it is the only sentence in the current literature that names the thing this page is titled after. A graft sits in a slit. Placed a fraction too shallow, the top of it heals proud of the skin: a small mound at every follicle, the cobblestone. Placed too deep, the skin heals down into the slit: a small dimple at every follicle, the pit. Both are decided in seconds, per graft, by whoever holds the implanter, and both are permanent once healed.

The other four are planning. In a series of 120 men treated with follicular unit transplantation, interviews with earlier transplant patients had identified two complaints: a straight anterior hairline that looked unnatural, and hair that looked like sprouted grass. The surgeons responded by seeding irregularly instead of in rows and placing single hairs along the anterior hairline in the direction of growth, and concluded that hair texture is very important, with additional care needed for dark-coloured and hard hair.^[5]

Rows, a ruler-straight front edge, thick grafts on the first line, hairs pointing the wrong way: every one of those is a decision made before the first graft goes in, and every one is visible at conversational distance. Our hairline design page shows what the edge should look like instead.

Who makes these errors

A repair-strategy review states that the use of small grafts alone does not protect the patient from poor work, and that errors in surgical and aesthetic judgment, performing procedures on non-candidates, and failure to communicate realistic expectations remain major problems; a separate review states that recipient-site problems can arise from either surgeon or assistant error, and that assistants contribute greatly to success or failure through graft dissection and placement.^[6,7]

Two things in that are worth carrying into any consultation. The technique being modern protects you from nothing on its own — a badly placed follicular unit is still badly placed. And the person who decides the depth of your grafts is very often not the surgeon. Cobblestoning is made at the placement step, and the placement step in a high-volume clinic is done by technicians, one graft at a time, for hours. The question “who will be holding the implanter” is not rude. It is the question.

At the far end of the same scale is the complication that scars. In the largest published series of recipient-site necrosis, 18 patients seen after follicular unit excision elsewhere, the commonest risk factors were smoking in 66.7 percent, hypertension and diabetes; all had had a single session averaging 3,899 follicular units, and scarring and graft failure occurred in every patient. A current review lists the technical risk factors as dense packing above 50 follicular units per square centimetre, sessions above 3,500 to 4,000 grafts, deep or overlapping slits, excessive tumescence and high epinephrine concentrations.^[4,8]

Notice what the technical risk factors have in common: more grafts, packed closer, cut deeper, in one session. The number that gets sold as the result is the number that carries the risk.

Coiled hair, and what nobody has written

Two proponents of dense packing, the practice of placing more follicular units per square centimetre in one operation than conventional transplantation, describe it as desirable in principle but state that not all patients are suitable and that it is not possible to achieve in certain patients, giving coarse or curly hair as the example; their ideal candidates have sufficient donor availability, reasonably stable hair loss and high hair-to-skin colour contrast.^[9]

That sentence is the whole of what the surgical literature says about placing grafts densely in hair like yours, and it says do not. It does not say why. Our follicle curvature explorer shows the reason we think it means: a coiled follicle curves under the skin, so the slit, the depth and the angle that suit a straight follicle do not automatically suit it.

We searched PubMed on 20 September 2026 for cobblestoning, pitting, unnatural results, wrong angle or direction, or repair surgery in patients of African descent or with Afro-textured hair and found no records. Widening to aesthetic or hairline terms returned two records, neither about surgical outcomes; the only paper on Black patients is a three-sentence report of one surgeon's observations. Without a population term the same searches return hundreds of records.

The earliest published account of hair transplantation in Black patients reports its author's own observations that, with slight modifications in how donor grafts are obtained, the integrity of the hair shafts and papillae is maintained, and that aesthetic results are generally comparable to those in white patients and often achieved with considerably fewer grafts. It reports no method, no count and no follow-up.^[10]

So the earliest word on the subject is optimistic and unmeasured, and the latest word does not exist. Our own register still holds nothing publishable on angle and direction planning for coiled hair, and the hairline page says so rather than filling the gap.

What repair consists of, and what it costs you

The same review states that management of unnatural results focuses on aesthetic revision: surgical excision or removal of misplaced grafts, redistribution, or camouflage by adding single-hair follicular units, with laser hair removal or electrolysis in selected cases to soften excessively dense or misplaced grafts. An earlier repair review describes the same three routes: punch or linear excision, which allows poorly planted grafts to be relocated; removal without reimplantation, which can be done by laser or electrolysis in special situations; and camouflage. It notes that the available donor supply is limited by hair density, scalp laxity and scar placement.^[4,6]

In a series of more than 40 patients dissatisfied with previous hair restoration surgery, the causes of unfavourable results were classified as technical errors, poor planning or complications; the author reports improvement in each of them, by amounts ranging from small to significant, in his own assessment. The challenges named were limited donor hair, reduced scalp laxity, vascularity that may be reduced by scarring, and patient scepticism; the complications of repair included one case of poor growth after extensive small-graft transplanting and one case of scalp scarring after removing a large number of plug grafts in a single procedure.^[11]

Three things to hold onto. Every repair spends donor hair you cannot get back, so the first question at a repair consultation is how much is left, not how much you want. Removing grafts leaves its own marks, and the series above records a scar from removing too many at once. And the only published series of repairs is one surgeon grading his own results, so “all improved” is a claim about his patients in his judgement, not a rate you can carry into your own case.

What we will not tell you

• That your previous clinic was incompetent, from a photograph. Some of what you are seeing may be healing, and the timeline above is the reason to wait before deciding.
• That it can be undone. Grafts can be moved, removed or camouflaged; the skin they sat in keeps its history.
• A repair cost or graft count before someone has counted your donor area.
• A rate for how often this happens in coiled hair. Nobody has published one.

What to ask — before the first operation, here or anywhere

1. Who will be holding the implanter, and for how long? Placement is where depth is decided; the answer should be a person and a plan, not a job title.
2. Show me a hairline you have done in coiled hair, at twelve months, from close up. Not the top of the head; the edge, at the distance a person stands.
3. How many grafts per square centimetre, and why that number for my hair? The dense-packing proponents themselves say it is not achievable in coarse or curly hair.
4. What happens if it heals uneven? Listen for who examines it, when, and what it costs you.
5. Show me the source for any complication figure you are given.

If what you are seeing is hair falling out rather than an uneven surface, that is shock loss, which is a different thing with a different timeline. If you want these questions answered about your own scalp, send them to us and we will answer in writing.