In short. Platelet-rich plasma, laser and light devices, microneedling and hair transplantation: what each can do, what each cannot, and honest candidacy.
Key points
- Donor density and stability, the pattern and stage of loss, and whether the underlying process can be controlled.
- A transplant performed on a scalp that is still losing hair quickly leaves a shrinking island of transplanted hair surrounded by further loss.
- This is why medical treatment usually continues before and after surgery, and why a transplant is judged over twelve months rather than at the dressing change.
Procedures attract more marketing than evidence, so it is worth being precise about what each option can and cannot do. None of them replaces medical treatment of the underlying process, and only one of them moves hair permanently from one place to another.
Platelet-rich plasma
Platelet-rich plasma is prepared from the patient’s own blood, concentrated, and injected into the scalp. Growth factors in the preparation are thought to support follicle activity. It is used in pattern hair loss, usually alongside medical treatment rather than instead of it, and in some immune-mediated cases. Evidence supports a modest benefit in some patients, with results that vary considerably between individuals and between preparation methods. It requires repeated sessions, and it is not a substitute for treating the cause.
Laser and light devices
Low-level laser and light devices are used both at home and in clinic. The proposed mechanism is improved energy metabolism and blood flow in the follicle. Evidence is mixed: several studies report modest improvement in pattern hair loss, particularly in combination with topical agents, but device quality, treatment time and adherence vary widely, and the effect is not comparable to medical treatment. Fractional laser and microneedling create controlled micro-injury and improve the penetration of topical agents; microneedling in particular is used as an adjunct, and both carry a small risk of provoking inflammation in an active scarring condition.
Hair transplantation
Transplantation takes hair follicles from the back and sides of the scalp, which are genetically resistant to androgen-driven miniaturisation, and moves them into thinning areas. Two techniques dominate: strip harvesting, which removes a strip of donor scalp and closes the site, and follicular unit extraction, which removes individual units. The critical and frequently misunderstood point is this: transplantation redistributes existing hair. It does not create new hair, it does not increase the total amount of hair a person has, and it does not stop the underlying process in the untransplanted scalp.
What candidacy really depends on
Donor density and stability, the pattern and stage of loss, and whether the underlying process can be controlled. A transplant performed on a scalp that is still losing hair quickly leaves a shrinking island of transplanted hair surrounded by further loss. This is why medical treatment usually continues before and after surgery, and why a transplant is judged over twelve months rather than at the dressing change.
Realistic expectations matter. A transplant can restore a hairline and increase density in a defined area; it will not restore a full head of hair, and it cannot help a scalp with insufficient donor hair. Folliculitis, poor growth, scarring and an unnatural hairline are the recognised risks, which is why the assessment and the surgeon’s own results matter more than the marketing.
Before committing to any procedure
- Confirm the diagnosis first, because a scarring process or active shedding changes everything.
- Ask what happens to the untransplanted hair over the next five years, and how that is planned for.
- Be cautious of any provider guaranteeing density or discouraging medical treatment.
Frequently asked questions
Does a hair transplant create new hair?
No. Transplantation takes follicles from the back and sides of the scalp, which are genetically resistant to androgen-driven miniaturisation, and moves them into thinning areas. It redistributes existing hair and does not increase the total amount a person has.
Why do most surgeons ask patients to continue medical treatment after a transplant?
Because transplantation does not stop the underlying process in the untransplanted scalp. A transplant on a scalp still losing hair quickly leaves a shrinking island of transplanted hair surrounded by further loss, so medical treatment usually continues before and after surgery.
Do laser devices and platelet-rich plasma replace medical treatment?
No. Evidence for low-level laser and light devices is mixed, with modest improvement reported particularly in combination with topical agents. Platelet-rich plasma shows a modest benefit in some patients, varies considerably between individuals, and is used alongside medical treatment rather than instead of it.
Risks & Limitations
- Most hair loss is progressive and managed rather than reversed; treatment holds the line more often than it restores it.
- Treatment takes 6–12 months before a response can be judged fairly, and must usually be continued indefinitely to keep the result.
- Stopping treatment commonly means losing the hair that was regained, usually within months.
- Some oral agents cause sexual, mood and metabolic side effects, and several require blood monitoring, blood-pressure monitoring, or pregnancy prevention.
- Hair transplantation moves existing hair; it does not create new hair and does not stop the underlying process.
- Scarring alopecia destroys the follicle permanently, so hair lost before treatment begins cannot be recovered.
- No treatment works for everyone, and response cannot be predicted with certainty.
When to Seek Care
- Sudden patchy hair loss, especially with scalp redness, scaling, itching or pain.
- Hair loss with fever, joint pain, mouth ulcers, or a rash elsewhere on the body.
- Scarring changes: an area of scalp that has become smooth, shiny or pale, with loss of the follicular openings.
- Eyebrow or eyelash loss, which suggests a more extensive or systemic process.
- Hair loss with fatigue, palpitations, weight change, or heavy or irregular periods — a systemic cause needs excluding.
References & Further Reading
- American Academy of Dermatology (AAD) — public and clinical guidance on hair and scalp disorders
- Chinese Medical Association, Dermatology Branch — clinical guidance
- Cochrane Library — systematic reviews in dermatology
- World Health Organization (WHO) — general health and nutrition resources
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.