The present invention relates to a cosmetic composition and / or dermatological composition. The composition comprises, as active principle, an oligomer of quercetin, said oligomers being endowed with an action on the factor keap1 and it contains 0,2 to 2% by weight of a solution containing a dry extract at the rate of 0,1 to 1% by weight, in which the oligomer is 3 to 30% by weight of the dry extract application of the oligomers of quercetin, in particular, the dimer treatment of cutaneous disorders.