In-Use Test With a Cosmetic Product

Inclusion Criteria: * age: ≥ 18 years * sex: approx. 50% male and approx. 50% female * users of hair tonic for dry scalp * dry, itchy scalp prone to atopic eczema / atopic dermatitis Exclusion Criteria: * any deviation from the above-mentioned criteria * users of sour hair rinse * subjects who wash their hair more than once a day * other dermatological disorders (scars, moles) on the scalp * known incompatibilities to cosmetics and ingredients of cosmetic test products (please see INCI) * topical medication in the test area within 1 month prior to study start * systemic medication with anti-inflammatory agents and antibiotics within 2 weeks prior to starting of the study * systemic medication with retinoids, antihistamines and/or immunomodulators (e.g. cortisone, corticosterone, chemotherapeutic agents) within 4 weeks prior to starting of the study * systemic illness of the subject at the beginning of the study * pregnancy and period of breastfeeding