What is male androgenetic alopecia?
Male androgenetic alopecia is the most common cause of male hair loss. It is a gradual change in the hair follicle associated with genetic predisposition and follicle sensitivity to androgen hormones, particularly dihydrotestosterone (DHT).
Under this hormonal sensitivity, certain follicles undergo a process called follicular miniaturisation. The hair growth cycle shortens, hair regrows finer and more fragile, and density gradually decreases.
Male baldness is therefore not just hair loss: it is a gradual transformation in follicle quality. Thick, pigmented terminal hairs are gradually replaced by finer hairs until some follicles become insufficiently active to produce a hair.
Hair PRP acts mainly during this miniaturisation phase, while the follicle is still present. The aim is to stimulate the follicle's biological environment to improve the density and quality of existing hair. When an area is completely bald and follicles are no longer functional, PRP cannot recreate new hair.
Areas typically affected by male hair loss
Male androgenetic alopecia generally follows a characteristic pattern. Unlike certain diffuse forms of loss, it affects specific scalp areas with greater sensitivity to androgen hormones.
Hair loss frequently begins with gradual recession of the frontal hairline and deeper temporal recessions. Some men then notice reduced density at the top of the head, called the vertex.
As alopecia progresses, these areas may gradually expand and merge, causing more substantial density loss on the upper scalp.
Hair on the sides and back of the head is generally better preserved because follicles in these regions are less sensitive to androgens. This notably explains why these areas serve as donor sites for hair transplantation.
Precisely identifying affected areas assesses the stage of alopecia and selects the most suitable management: preventing progression, PRP stimulation or referral to another solution when loss is too advanced.
Why act early on male baldness?
Early management of male hair loss is essential because hair stimulation treatments act mainly on still-active follicles.
In androgenetic alopecia, hair loss is gradual. Over several years, follicles do not disappear immediately: they produce increasingly fine and less resilient hair.
This period represents an important window for intervention. While follicles are still present, certain treatments such as hair PRP can help improve their environment and support their activity.
Waiting for complete density loss limits therapeutic options. A completely bald area often means follicles can no longer produce visible hair.
Early diagnosis also monitors hair loss progression, adapts the protocol over time and offers a personalised strategy according to the stage of alopecia.
When is hair PRP indicated in men?
Hair PRP is mainly offered to men with early or moderate hair loss, when follicles remain present and able to respond to stimulation.
The most common indication is male androgenetic alopecia.
PRP acts on the hair follicle environment through growth factors released by platelets. The aim is to improve the biological conditions needed for follicular activity and support existing hair growth.
Treatment may be useful when the patient notices lost density, finer hair or gradual hairline recession.
PRP cannot regrow hair in an area where follicles have completely disappeared. Advanced baldness with a completely bare area generally requires another approach, such as hair transplantation when appropriately indicated.
How does PRP work against hair loss?
PRP, or platelet-rich plasma, uses the natural repair capacities present in blood.
After blood is taken, the sample is prepared to obtain a platelet concentrate containing various growth factors. This plasma is then injected directly into scalp areas affected by reduced density.
Factors released by platelets contribute to several mechanisms studied in hair growth: stimulation of follicular activity, improvement of the scalp environment and support for the hair growth phase.
PRP does not act as an implant or add new hair. It aims to optimise the function of still-active follicles.
This distinction is important for understanding possible treatment results.
When are hair PRP results visible in men?
Hair PRP results are gradual because they follow the natural hair cycle.
The first changes often concern improved quality of existing hair: hair perceived as stronger, reduced shedding in some patients and gradual improvement in density.
Progress is measured over several months because hair growth is a slow process.
Results depend on several factors: patient age, stage of alopecia, quality of remaining follicles and consistency of the protocol.
Early diagnosis generally improves the potential response because more follicles remain active.
Does hair PRP work on advanced baldness?
PRP has significant limitations in advanced stages of baldness.
When a hair follicle is no longer functional, no stimulation can create a new hair. In this case, PRP alone is generally not the appropriate treatment.
However, it may be discussed alongside other strategies, particularly around hair surgery, according to medical assessment.
Correctly identifying the stage of hair loss is therefore essential before starting treatment.
PRP effectiveness in men: scientific studies
Hair PRP is the subject of numerous medical studies for male androgenetic alopecia. Scientific publications show encouraging results, mainly in patients with early or moderate hair loss and still-active follicles.
Several systematic reviews and meta-analyses in international medical literature have assessed platelet-rich plasma effectiveness in androgenetic alopecia. A meta-analysis published in 2023 showed a significant increase in hair density in PRP-treated patients, with a particularly promising response in men with androgenetic alopecia.
Another meta-analysis published in a PubMed-indexed journal also found improved hair density after PRP treatment compared with baseline, particularly after several months of follow-up.
Studies suggest that PRP mainly improves existing follicle activity rather than creating new follicles. Its value is therefore greater in early alopecia, when hair miniaturisation is still reversible.
However, scientific data show variable results between patients. Effectiveness depends on the stage of baldness, age, protocol used, platelet concentration obtained and regularity of sessions.
PRP should therefore be considered a hair stimulation treatment with specific indications. Scalp assessment remains essential to determine whether the patient is a good candidate.
Hair PRP for men in Geneva: why establish a diagnosis before treatment?
Before hair PRP treatment, the essential step is to determine the exact cause of hair loss.
Not all hair loss responds to the same treatment. Androgenetic alopecia, reactive shedding and temporary density loss require different management.
Consultation assesses the scalp, hair loss progression, the patient's history and objectives.
An effective PRP protocol relies on an appropriate indication: stimulating follicles capable of responding, offering suitable follow-up and referring to another option when PRP is not the appropriate treatment.
Article written by Dr Valeria Romano
Dr Valeria Romano supports each patient through a comprehensive approach to facial, body and intimate aesthetics, as well as skin and hair quality. Every treatment is based on a personalised medical assessment.
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