Age influences the skin reaction pattern to mechanical stress and its repair level through skin care products.

Skin aging is associated with alterations of surface texture, sebum composition and immune response. Mechanical stress induces repair mechanisms, which may be dependent on the age and quality of the skin. The response to mechanical stress in young and aged individuals, their subjective opinion and the objective effectiveness of skin care products were evaluated by biophysical skin quality parameters (stratum corneum hydration, transepidermal water loss, skin pH, pigmentation and erythema) at baseline, 1, 6, 24h and 7days at the forearms of 2 groups of healthy volunteers, younger than 35 years (n=11) and older than 60 years (n=13). In addition, casual surface lipid composition was studied under the same conditions at the baseline and day 7 after mechanical stress induction. Evaluations were also performed in stressed skin areas treated daily with skin care products and the subjective opinion of the volunteers was additionally documented. The tested groups exhibited age-associated baseline skin functions as well as casual surface lipid composition and different reaction patterns to mechanical stress. Skin care was more effective in normalizing skin reaction to stress in the young than in the aged group. The subjective volunteer opinion correlated with the objective measurements.

Reduced content of chloroatranol and atranol in oak moss absolute significantly reduces the elicitation potential of this fragrance material.

BACKGROUND: Oak moss absolute, an extract from the lichen Evernia prunastri, is a valued perfume ingredient but contains extreme allergens. OBJECTIVES: To compare the elicitation properties of two preparations of oak moss absolute: 'classic oak moss', the historically used preparation, and 'new oak moss', with reduced contents of the major allergens atranol and chloroatranol. PATIENTS/MATERIALS/METHODS: The two preparations were compared in randomized double-blinded repeated open application tests and serial dilution patch tests in 30 oak moss-sensitive volunteers and 30 non-allergic control subjects. RESULTS: In both test models, new oak moss elicited significantly less allergic contact dermatitis in oak moss-sensitive subjects than classic oak moss. The control subjects did not react to either of the preparations. CONCLUSIONS: New oak moss is still a fragrance allergen, but elicits less allergic contact dermatitis in previously oak moss-sensitized individuals, suggesting that new oak moss is less allergenic to non-sensitized individuals.

A photographic scale for the evaluation of facial skin aging in Indian women.

The process of facial skin aging differs between different ethnic populations. Standardized tools to objectively evaluate facial skin aging in clinical and epidemiological studies in different ethnic populations are needed. We designed and validated a photonumeric scale for assessment of facial aging in the Indian population. A total of 149 subjects were selected from an electronic photographic database of 300 women from the Mumbai region. An expert consensus panel selected nine subjects representing a spectrum of skin damage from none to severe, on the basis of wrinkling and tissue slackening. The nine-point scale, composed of one face-on and one oblique photo of the same subject per grade, was validated by nine independent judges in 99 subjects with a repetition two weeks later. Inter-observer reliability and intra-observer reproducibility were calculated using Kappa coefficients. Validation of the scale showed a high level of inter-observer reliability between the consensus and independent panels, and intra-observer reproducibility between the two evaluations performed by the independent judges. In conclusion, this nine-point facial aging scale is a reliable tool for clinical evaluations of skin damage in Indian women, suitable for use in clinical and epidemiological studies.