Repairing an old strip (FUT) scar: grafts, SMP and revision options

Strip harvesting, also called FUT, removes a thin band of scalp from the back of the head and stitches the edges together. The grafts are then cut from that strip under a microscope. For many people the line heals neatly and stays hidden under a few centimetres of hair. For others it widens, sits higher than expected or becomes obvious when they want to cut their hair short. Years later, some come back asking what can be done about it.

This guide explains why strip scars differ, the main repair options (grafts into the scar, scalp micropigmentation and surgical revision), what the small published studies show and how to plan a repair with realistic expectations. It is general information, not personal medical advice.

Short answer

A strip (FUT) harvest always leaves a linear scar; how visible it is depends on strip width, closure technique, scalp laxity and healing ^{1 2}. In one study of 30 patients, wider strips were linked with wider scars and lower satisfaction, and double trichophytic closure gave the most acceptable scars ¹. Options suggested for an existing scar include grafting follicles into it, scalp micropigmentation (SMP), and re-excision with trichophytic closure ³. FUE grafting into linear scars can help, but survival in scar tissue may be lower than in normal scalp; one series of craniotomy scars reported about 66% survival at one year ⁴. SMP can camouflage scars and is often combined with grafts ^{5 6}. Evidence comes from small case series, so a careful assessment of the scar and remaining donor hair comes first.

Why some strip scars are more visible

Every strip harvest leaves a line. A good result is a fine scar that is covered by hair worn at a moderate length. A visible result is usually one of the following:

• A wide scar. In the study of 30 patients, scar width rose as strip width rose, and satisfaction with the donor area fell ¹.
• A stretched scar. Tight closure or a scalp with little laxity can let the scar spread during healing ³.
• A high or uneven scar. A strip taken too high may sit in an area that thins later with pattern hair loss, making the line easier to see.
• Multiple scars. People who had two or more strip procedures may have more than one line.
• Thinning around the scar. Over-harvesting nearby or later FUE can reduce the hair that once hid the line. See your donor area.

The first question in any repair is whether the problem is the scar itself, the hair around it, or both.

Option 1: Grafts into the scar (FUE)

Follicles are harvested with FUE, from elsewhere in the donor area, and placed directly into the scar. The goal is not to make the scar disappear but to put hairs in and around it so the line breaks up and blends.

What to know:

• Scar tissue behaves differently. It can be firmer and have a poorer blood supply than normal skin, so grafts may survive less predictably.
• Results in linear scars. In a series of 10 patients with linear scars after craniotomy treated with FUE, mean graft survival at one year was about 66%, and patients who reached at least 20 follicular units per square centimetre more often had good results ⁴. This was a different type of scar, but it shows that linear scars can respond and that density matters.
• A test or second session is common. Some surgeons graft a small area first, or plan two sessions, because the first may not reach the density needed.
• Donor hair is finite. Grafts for the scar come from the same donor zone. If donor hair is already limited, beard or body hair is sometimes considered ⁷. See body hair transplants.

Grafting also does not change the scar's texture or width; it only adds hair.

Option 2: Scalp micropigmentation (SMP)

SMP uses fine needles to place tiny pigment dots that imitate the look of shaved hair follicles. Over a scar, the aim is to make the line look like it contains the same short hair as the skin around it.

• In a Korean series of 43 patients, which included six patients with scalp scars, results were rated highly satisfactory in all but one case, with no adverse effects reported ⁵.
• Reviews describe SMP as a concealer for scalp scars and deformities, and note that natural results depend on dot size, colour and density ^{6 8}.
• Scar tissue may take pigment differently, so touch-ups are common.
• Poor SMP can spread, change colour or look too dense. Correction is possible but can take several sessions, including laser ⁹.

SMP is often a good fit for people who keep their hair short and want the scar to blend with the stubble around it. See SMP for scars and SMP after a hair transplant.

Option 3: Surgical revision (re-excision)

In some cases a surgeon removes the wide scar and closes the wound again, often with a trichophytic closure. In this technique one wound edge is trimmed so that hairs can grow through the healed scar, which helps camouflage it ^{1 3}.

• When it may help. A wide scar on a scalp that is still loose, where the original widening was not mainly due to tension.
• When it may not help. A tight scalp, a scar that widened because of tension or poor healing, or a tendency to thick scars. Re-excision can widen again.
• Technique matters. A small case report described less scar widening where a columnar trichophytic suture was used, compared with about 7 mm of widening where a simple closure was used in the same patient ³. This is a single case, not proof.

Revision is usually followed by healing time and a review before any grafts or SMP are added.

Comparing the options

Why FUE is not "scarless"

Many people choose FUE today partly to avoid a linear scar. That is reasonable, but FUE is not scarless. It leaves many small round scars, and taking too many grafts can make the donor area look thin or patchy ^{10 11}. Some people with an old strip scar who later have FUE end up with both a line and a thinned area around it. Plan the whole donor area, not just the scar. See FUE vs FUT.

Scarring alopecia is a different problem

A strip scar is a surgical scar in otherwise healthy skin. Primary cicatricial (scarring) alopecia is an inflammatory disease that destroys follicles. A systematic review of transplants in inactive scarring alopecia found that graft survival was about 83% at 7 to 12 months but fell over the following years, with some patients having disease reactivation ¹². If your scar area is spreading, itchy, red or growing, see a dermatologist before any repair, because the cause may not be the old surgery.

Before your consultation

• Take clear photos of the back of your head with hair wet and dry, and with hair clipped to the length you want to wear.
• Find your old records if possible, including the year, number of grafts and whether more than one strip was taken.
• Decide on your hair length. The best option for a number 1 clipper cut is very different from the best option for hair worn at 3 cm.
• Ask about donor reserves. How many grafts could be taken safely for the scar and for any future work on the top? See a second hair transplant.
• Ask about staged plans, such as grafts first and SMP later, or revision first and grafts after healing.
• Bring questions in writing. See questions for a hair transplant consultation.

Life in Malaysia

Heat, humidity and sweating are part of daily life here, and many people keep their hair short for comfort. That makes strip scars more noticeable for some men than when they first had surgery. After grafts or revision, follow your clinic's instructions on washing, sun protection and when to return to helmets, caps, sports and swimming. See downtime after a hair transplant.

After SMP, sun exposure may fade pigment, so a hat outdoors is sensible. Ask how long to avoid sweating heavily, swimming and saunas, since this varies by practitioner. If you are comparing clinics, ask for written quotes that list each stage, including any touch-ups. See hair transplant cost.

• Keep a simple diary of each stage with dates and photos so you and your doctor can compare progress fairly.

Common myths

• "A strip scar can be erased." No technique removes a scar completely. Repairs aim to make it less visible.
• "FUE leaves no scars." It leaves many small ones ¹⁰.
• "Grafts grow in scar tissue just like normal skin." Survival can be lower and more variable ⁴.
• "SMP looks the same forever." Pigment can fade or shift and often needs touch-ups ⁹.
• "Cutting out the scar always makes it thinner." It may widen again if tension caused the first scar.

Common mistakes

• Choosing a repair before deciding how short you want to wear your hair.
• Using up remaining donor hair on the scar without a plan for future thinning on top.
• Having SMP made too dark or too dense to cover the scar quickly.
• Ignoring active scalp symptoms that may point to a scalp disease rather than a surgical scar.
• Judging grafts in the scar before about 12 months.
• Choosing a clinic only on price without seeing photos of similar scar repairs.

How a doctor assesses hair loss

A doctor will look at the scar's width, length, position and texture, and check the hair density and quality around it. They will assess scalp laxity, look for signs of scalp disease and estimate how many donor grafts are available. They will also look at the rest of your scalp to see whether pattern hair loss is still progressing, because that affects how much donor hair should be saved. Medical treatment may be discussed to protect existing hair.

Questions to ask your doctor

1. How wide is my scar, and why do you think it widened?
2. Would grafts, SMP, revision or a combination suit my scar best?
3. How many grafts would the scar need, and how much donor hair would remain?
4. What growth do you expect in scar tissue, and might I need a second session?
5. Is my scalp loose enough for re-excision?
6. How many strip scar repairs have you done, and can I see photos?
7. If SMP is used, how will colour and density be matched, and what about touch-ups?
8. Are there any signs of scalp disease that need treatment first?

Bottom line

An old strip scar can often be made less visible, but not erased. FUE grafts can add hair into the line, SMP can blend it with short hair around it, and re-excision with trichophytic closure may help in selected wide scars. Many repairs combine approaches. The evidence comes from small studies, so the right plan depends on your scar, your donor reserves and how you want to wear your hair. For an overview of options, see hair loss treatment in Malaysia.

Frequently asked questions

Why did my strip scar become wide?

Scar width depends on how wide the strip was, how tight the closure was, scalp laxity, healing and technique. In one study, wider strips were linked with wider scars and lower satisfaction with the donor area.

Can hair be transplanted into a strip scar?

Yes. FUE grafts can be placed into scar tissue to break up the line. Scar tissue may have a poorer blood supply than normal skin, so growth can be less predictable and a second session is sometimes needed.

Does scalp micropigmentation hide a strip scar?

SMP places tiny pigment dots that imitate the shaved hair pattern around the scar. Small series report high satisfaction, but the result depends on matching the surrounding hair density and on the practitioner's skill.

Can the scar be cut out and closed again?

Sometimes. A surgeon may excise a wide scar and close it with a trichophytic technique if the scalp is loose enough. If tension caused the first scar to widen, re-excision may widen again, so this needs careful assessment.

Which option is best?

It depends on scar width, how short you want to cut your hair, remaining donor hair, scalp laxity and budget. Many repairs combine grafts and SMP.

Will FUE leave no scars at all?

No. FUE avoids a long line but leaves many small dot scars. It is not scarless, and over-harvesting can thin the donor area.

How long before I see the result of grafts into a scar?

Like other transplants, grafts usually shed and then grow over several months. Judge the result at about 12 months.

Can SMP be removed if I do not like it?

Unsatisfactory SMP can sometimes be corrected or lightened with laser, but this takes several sessions and may not be complete. Choose an experienced practitioner and start conservatively.

Educational content. Not medical advice.