A 4-weeks Comparative Study of Cosmetic Product Versus Standard Medical Care in Subjects With Seborrheic Dermatitis

Inclusion Criteria: * Male or Female aged between 18 and 70 years included * Subject affiliated to a social security system or health insurance, or is a beneficiary if applicable * Subject having a squamous state of the scalp: * clinically visible (Squire score ≥ 20), * recurrent (at least twice a year) * having signed their written Informed Consent form (ICF) for their participation in the study and a photograph authorization * Subject having a recent prescription of Standard Medical Care (Ketoconazole 2%) not yet initiated * Subject accepting that according to the randomization, the Standard Medical Care can be possibly replaced by another shampoo, including neutral shampoo * Subject having a maximum usual shampoo frequency of 3/week Non Inclusion criteria * Subject who, in the judgement of the investigator, is not likely to be compliant with study-related constraints and requirements * Subject having any other dermatologic condition than the studied squamous state on hair/ scalp and liable to interfere with the study assessments: * alopecia having caused hair loss on the upper part of the scalp (Norwood Hamilton stage\> III, Ludwig ≥ I-4, alopecia aerata, alopecia totalis) * raised skin lesion, likely to be traumatized, … * Subject having dermatological pathology or evolutive skin lesion on the scalp (contact dermatitis, psoriasis, severe excoriations, severe sunburn, cutaneous bacterial superinfection of the scalp clinically obvious ...) * Topical treatment…