The aim of the study is to evaluate, with clinical, biological and biometrological assessment methods, the effectiveness of RV3438G shampoo, after 2 weeks of short intensive treatment phase and also the effects of a maintenance phase of 8 weeks in association with a neutral shampoo, or with a gentle balancing shampoo, compared to a neutral shampoo used single.

This is a bicentric, comparative (during the maintenance phase), randomized, controlled and open study, in parallel groups conducted in subjects having mild to moderate recurrent squamous states, for 10 weeks.

4 visits are planned. The maximum duration of the study is 74 days from inclusion visit to the End-of-study visit.

The study area is the whole scalp.

4 visits are performed: Visit 1: Inclusion (Day1) : start of the short intensive treatment phase (phase 1) Visit 2: Intermediate visit (Day15 ± 3 days, Week 2) : end of the short treatment intensive phase and start of the maintenance phase (phase 2) Visit 3: Intermediate visit (Day 43 ± 3 days, Week 6) : middle of the maintenance phase Visit 4: End-of-study visit (Day 71 ± 3 days, Week 10) : end of the maintenance phase

Inclusion Criteria:

Criteria related to the population:

- Subject aged between 18 and 60 years included

Criteria related to the disease:

Subject having a squamous state of the scalp :

• clinically visible (Squire score ≥ 20),
• with an intensity of the squamous state superior or equal to 2 on a scale from 0 to 3 on at - least 1 of the 4 scalp areas
• recurrent (at least twice a year)
• associated to erythema and pruritus: erythema scoring superior or equal to 1 on a scale from 0 to 3 on at least 1 scalp area desquamating of the 4 scalp areas pruritus scoring assessed by the subject superior or equal to 3 on a numerical scale from 0 to 10 (mean pruritus felt on the last 3 days)

Exclusion Criteria:

Criteria related to the diseases / skin condition:

• Subject having frizzy hair
• Subject with an alopecia having caused hair loss on the upper part of the scalp (Norwood Hamilton stage> III, Ludwig ≥ I-4, alopecia aerata, alopecia totalis), Seborrheic dermatitis requiring medical treatment

Criteria related to treatments and/or products:

• Systemic treatment with nonsteroidal anti-inflammatory, corticosteroid, antibiotic, antihistamine taken during 5 consecutive days within the 2 weeks before the inclusion or planned during the study and liable to interfere with the study assessments
• Topical treatment or product applied on the scalp within 2 weeks before the inclusion or planned during the study that can be active on squamous states or that can limit the effectiveness of the study product: anti-inflammatory drugs, ketoconazole, anti-dandruff shampoo, anti-fungal, rinse with vinegar, essential oils ...
• Any scalp dyeing, bleaching, perm, smoothing / straightening performed within 2 weeks before inclusion

Subjects will be recruited from the panel of volunteers of the centre. The subjects corresponding to eligibility criteria may receive a phone call, a letter or an e-mail proposing to participate to the clinical study.