Composition based on salicylic acid derivatives

An aqueous composition for topical application comprising:

• at least one (C8-C14)alkyl betaine and
• at least one salicylic acid derivative of following formula (I):
• wherein:
• the R radical denotes a saturated, linear, branched or cyclic, aliphatic chain having from 2 to 22 carbon atoms;
• an unsaturated chain having from 2 to 22 carbon atoms comprising one or more double bonds which can be conjugated;
• an aromatic nucleus bonded to the carbonyl radical directly or via saturated or unsaturated aliphatic chains having from 2 to 7 carbon atoms;
• it being possible for the said groups to be substituted by one or more identical or different substituents chosen from (a) halogen atoms, (b) the trifluoromethyl group, (c) hydroxyl groups in the free form or in the form esterified by an acid having from 1 to 6 carbon atoms or (d) a carboxyl functional group in the free form or in the form esterified by a lower alcohol having from 1 to 6 carbon atoms;
• R′ is a hydroxyl group;
• and their salts resulting from an inorganic or organic base,
• the molar ratio of the (C8-C14)alkyl betaine(s) to the salicylic acid derivative(s) being equal to or greater than 1.