Abstract: In order to study on the properconcentrations for patch test(PT),and the availability of PT with the suspected cosmetic products used by the patients,PT of various cosmetic products was performed on 35 healthy subjects and 38 patients with non-contactderm atitis and non-eczem a by using different concentrations of cosmetic products and their vehicles in cosmetic products.In 62 patients with-cosmetic dermatitis PT was done using their own suspected causative cosmetic products.The results-showed that most products could be tested "with originalproducts",without dilution,such as skin care-products(cream),lipsticks,hair care products(hair cream,hair oil,mousse),others had to be diluted, such as hair dyes,hotoiland soap,to 2% solution,sham poos to 5% solution,permanent wave solutions and perfumes to 5% or 10% in distilled water,nailvarnish to 5% or 10% inacetone.The totalpositiverate of PT by using suspected cosmetics was 95.16%.Our results indicate that PT concentrations and vehicles vary with different products in suspected cosmetics,PT of the suspected causative cosmetic-products is an important means for the diagnosis of cosmetic derm atitis.Our study provides necessary-data for the further study of Chinese standard cosmetic screening series allergens for PT.

Key words: Cosmetic dermatitis, Patch test