FUE, FUT or DHI for Coiled Hair: What Is Measured, and What Is Sold

FUE, FUT, DHI, sapphire. They are sold as four products at four prices. They are two decisions — how the graft comes out of your head, and how it goes back in — and a blade. For coiled hair one of those decisions has been studied and the other has not, and this page keeps the two apart.

Three letters, two decisions

Getting the graft out. Strip surgery (FUT) removes a band of skin from the back of the head and dissects it into follicular units under a microscope, leaving one line. Excision (FUE) lifts each unit out through a small round punch, leaving a field of dots. Putting it in. Either a blade opens a slit and forceps place the graft, or an implanter pen makes the opening and places the graft in one motion — the thing sold as DHI. The blade. Sapphire versus steel is the material the slit is cut with. It has nothing to do with how the graft was harvested, whatever the package name implies.

Getting it out: what has been measured

A review comparing the two harvest methods concludes that follicular unit excision and strip surgery are equally effective in generating high-quality grafts and differ in their scarring of the donor region: strip surgery leaves a linear scar, excision leaves punctate scars that are typically easily concealed; distinct subgroups of patients are eligible for one method, the other, or both.^[1]

“Easily concealed” is true for the skin the review had in mind. On darker skin it is less true, and that is on record: Follicular unit excision is not scarless. Each punch takes the follicular melanocytes out with the graft, and the wound can heal as a small pale dot — reported as more visible in darker skin phototypes and with short hairstyles. The review that documents this grades it common but gives no incidence figure.^[2,3]

The largest published series of follicular unit excision in patients of African descent used 18 and 19 gauge punches throughout — nominally about 1.1 to 1.3 mm. A 2026 complications review lists punches over 1 mm as a risk factor for donor-site hypopigmentation in darker skin phototypes, and recommends 0.8 to 0.9 mm. No published work reconciles the two.^[2,4]

The strip side has its own unmeasured parts. In 88 patients who had strip harvesting, donor scar width measured ten months after surgery correlated positively with preoperative scalp laxity and elasticity, and patients in the upper thirtieth percentile of elasticity, at ten millimetres or more, had significantly wider scars than the rest.^[5]

In 10 patients who had follicular unit excision after an earlier strip harvest, the strip scar averaged 2.47 millimetres wide, hair density was 155.4 hairs per square centimetre above the scar and 130.8 below it, hair angle differed above and below, and transection during excision was doubled below the scar; the author concludes that strip surgery leaves impacts on the donor area other than the scar.^[6]

And the scar question that matters most on this site: Keloid scarring is described as a rare complication of hair transplantation, usually associated with strip harvesting rather than follicular unit extraction. It has nevertheless been reported at the donor site after follicular unit extraction, including one extensive case, and one report advises particular awareness in patients with previous keloidal tendencies. A scoping review found hypertrophic scarring or keloid formation to be the most common donor-site complication after strip surgery, at up to 15.1 percent.^[7,8,9]

Coiled hair and the punch: the one part with a literature

Everything published about transplanting Afro-textured hair is about this step, and it is worth reading in that light: the problem the literature has solved is getting a curved follicle out through a straight punch without cutting it.

In a case series of 18 patients with tightly curled hair, conventional rotary punches either failed outright or produced excessive transection in 8 of them, while a curved non-rotary punch kept transection below 5%.^[10]

In a retrospective series of 64 patients of African descent, the mean transection rate was 3-6%, and scalp thickness and firmness affected it more than hair curliness did.^[4]

For context, a study of 42 patients undergoing conventional FUE with a 1 mm punch found transection in 6.3-7.4% of grafts. Transection is not unique to textured hair; it is a feature of the technique.^[11]

Punch geometry is the lever surgeons have used against transection: shapes that keep the cutting edge away from the follicle beneath the skin have been reported to reduce it.^[12]

Three things follow. The punch is not a detail for coiled hair; it is the technique. The series that measured it are small and come from one group of surgeons. And nobody has published a strip series in Afro-textured hair at all, so the FUE-versus-FUT comparison above was made on other people’s scalps. Our follicle curvature explorer shows why the punch matters as much as it does.

Putting it in: forceps, implanter, and the letters DHI

A review of graft placement states that the implanter, which creates the incision and places the follicular unit in one motion, was introduced by Choi and was popular first in East Asia because Asian hair is typically straight and thick with units of one or two hairs; that the uniform graft size of follicular unit excision and the possibility of delegating placement were key attractions in its adoption; that forceps allow safe placement in the hands of well-trained teams; and that the greater fragility of excision grafts has led to growing acceptance of implanters.^[13]

Read that as a reader with coiled hair. The tool was designed around hair that is straight, thick and grows one or two to a unit — the opposite of yours on every count. That does not make it wrong for you. It means the case for it was made on other hair. Note the second thing the review names as an attraction: the placement can be delegated. The pen is easier to hand to a technician than forceps are, which is a fact about staffing, not about your follicles.

How much counting stands behind the implanter? In four Korean men, single-hair follicular units were placed with an implanter into tattooed one-square-centimetre templates at 20, 30, 40 and 50 per template and counted at ten months; survival was higher at 20 and 30 per square centimetre than at 40 and 50, and the authors note the small sample and the limitation to single-hair units.^[14]

One comparison of graft loss between forceps and implanter placement exists in the literature. It is a three-page letter with no abstract, we have not been able to read it, and it is recorded in our library as exactly that.

We searched PubMed on 20 September 2026 for strip harvesting, implanter or DHI placement, and sapphire or slit recipient sites in patients of African descent or with Afro-textured hair. Each search returned no records. Every published study of hair transplantation in Afro-textured hair, six records in all, concerns how the graft is extracted with a punch; nothing is published on how it is placed or on the blade used.

The sapphire word

In a prospective observational study of 1,000 patients at one centre, graft survival was reported as 94.7 percent with a sapphire blade and 88.9 percent with a steel blade, implantation was 1.3 hours shorter with double-forceps insertion, and two-day full-head operations reached 43.2 grafts per square centimetre with a satisfaction score of 9.4; patients were divided into groups rather than randomised, and the abstract does not state how survival was counted.^[15]

That is the largest series on the blade almost every Turkish clinic page names, and it is worth having read. It is also one centre, patients sorted into groups by the clinic rather than by chance, and an abstract that does not say how survival was counted. A six-point difference in a study built that way is a reason to ask questions, not a reason to pay for a word. Our pricing page describes what each technique mechanically changes; this is the evidence behind that description.

What we do, and what we will tell you before surgery

What we will not tell you

• That FUE is scarless, or that the dots will not show on your skin. The review that grades the dots common names darker skin as where they show.
• That DHI, or any placement method, gives better results in coiled hair. Unmeasured.
• That a sapphire blade raises survival for you. One non-randomised series; no coiled-hair data.
• That strip surgery is safe or unsafe for Afro-textured hair. No series exists either way; the keloid and hypertrophic-scar figures come from other populations.

What to ask — here or anywhere

1. What punch, what diameter, and how do you handle a curved follicle? The only coiled-hair literature is about this; a clinic that cannot answer has not read it.
2. Who opens the sites and who places the grafts? Names and roles. The implanter makes delegation easy; ask what was delegated.
3. Why this placement method for my hair? Listen for a reason about your follicles, not a package name.
4. What does “sapphire” change, and what is the evidence? The honest answer is the blade material, one observational series, and nothing on coiled hair.
5. If you do strip surgery, how many Afro-textured patients have you done it on, and what did their donor scars look like at a year? There is no published answer; there should be a personal one.

How many grafts your donor area can give, whichever way they come out, is on the donor density explorer; what the punch has to do inside the skin is on the follicle curvature explorer. If you want these questions answered about your own hair, send them to us.