Alopecia involves a diminution of visible hair that can have significant psychosocial effects and impairment of quality of life. There are numerous types of alopecia, among them, androgenic alopecia (AGA) is the most common form surgically treatable.

Androgenic alopecia is characterized by progressive visible thinning of scalp hair in genetically susceptible men (MAGA, or male pattern androgenic alopecia) and in some women (FPHL, or female pattern hair loss).

Among the plethora of products available proposed to promote hair growth in the scalp, only 2 medications are approved by the US Food and Drug Administration (FDA). These medications are finasteride (systemic) and minoxidil (topical).

In some cases, limited perceived efficacy of these treatments, poor tolerance, fear and lack of information on treatment duration and possible adverse events may lead to premature stop of treatment, disappointment and influence on patient compliance.

When conventional treatments have proven to be deceptive, a surgical treatment can be considered: hair transplant, that has evolved mainly with the aim of making the results look more and more natural.

Hair transplant, although performed on an outpatient basis, is an invasive technique, with the following immediate side effects: pain, pruritus, inflammation, scabs, swollen eyelids with tearing which last about 15 days. A social exclusion for 15 days after the transplant is generally necessary. For 1 to 2 months, the Red Scalp syndrome or inflammatory scalp is observed.

The growth of transplanted hair starts from the 6th month and the expected result is not really achieved until one year.

The product RV4986A is a non-rinsed cosmetic lotion intended to be used every day on the entire scalp especially in case of hormonal or hereditary chronic hair loss (as AGA) and also before hair transplant in order to prepare hair scalp and after hair transplant in order to soothe the scalp.

To date, no consensus and guidelines for pre- and post-transplant management exist regarding cosmetic products to apply that could limit their transplant side effects in time and intensity.

The aim of the study is to assess the effect of a new product (topical lotion) developed as an adjuvant product pre- and post-transplant that prepares hair scalp before the transplant and soothes it after hair transplant.

Main inclusion criteria:

• Male
• Subject requiring hair transplant with micrografts (strip technique or FUE technique)
• Subject aged ≥ 18 years old
• Subject having androgenetic alopecia selected by the investigator for a hair transplant

Main non-inclusion criteria:

• Subject having any other hair disorder or hair disease (telogen effluvium, alopecia areata, cicatricial alopecia, hair shaft disorder, trichotillomania…) and liable to interfere with the study assessments
• Subject having dermatological pathology or evolutive skin lesion on the scalp (psoriasis, seborrheic dermatitis, severe erythema, severe excoriation, severe sunburn, …)
• Iron deficiency (confirmation by ferritin assay results from less than 3 months performed during preoperative assessment)
• Thyroid disorders (confirmation by thyroid hormon assay results from less than 3 months performed during preoperative assessment)
• Systemic treatment with antithyroid or iron supplement established or modified within 3 months before the inclusion or planned during the study
• Radiotherapy or chemotherapy at any time before the inclusion or planned during the study
• Systemic anti-hair loss treatment (anti-androgenic treatments…) established or modified within 6 months before the inclusion visit or planned during the study
• Topical anti-hair loss treatment (Minoxidil…) established or modified within 3 months before the inclusion visit or planned during the study
• Any other systemic treatment (cardiovascular, endocrine, antidepressant, antipsychotic, …) established or modified during the previous weeks before the inclusion or planned to be established or modified during the study, liable to interfere with the evaluation of the efficacy or cutaneous tolerance of the products according to the investigator's assessment
• Any other topical treatment or product applied on the scalp within previous weeks before the inclusion or planned during the study that can limit the effectiveness of the transplant and liable to interfere with the study assessments, according to the investigator's opinion