Xerotic Dermatitis in Aged People

Inclusion Criteria: * Aged from 70 years * With xerotic dermatitis, clinically assessed , * At least on the anterior part of lower and/or upper limbs, * Presenting itching xerotic dermatitis evolving from at least 3 weeks * Intensity of itching ≥ 4 on VAS (0-10) at th inclusion time * With MMSE score ≥ 20 dating less than 6 months * Affiliated to a social security system, or is a beneficiary (as applicable in the national regulation) Exclusion Criteria: * Criteria related to pathologies * Severe form of other dermatitis requiring either systemic treatment \-- Itching xerotic dermatitis from iatrogenic origins * Dermatological disease other than xerotic dermatitis which could interfere with the assessment, * Systemic disease that may generate xerotic dermatitis and /or pruritus * Immunosuppression condition, * History of serious disease considered by the investigator hazardous for the patient or incompatible with the study. * Criteria related to treatment \- Use of treatment which could interfere with the evaluation of the disease or the course of the disease * Criteria related to the population * Ongoing participation to another clinical trial or participation in the previous month before the inclusion * Patient under guardianship or trusteeship