To provide a cosmetic process for treating the skin, especially the aged and/or wrinkled skin.

At least one inhibitor of RhoA kinase production and/or activation in an effective amount is used as an agent for relaxing features and/or for decontracting the skin in a composition for a cosmetic. The compound is especially intended for preventing and/or combating the signs of ageing of the skin, in particular wrinkles, and preferably expression wrinkles. The invention also relates to a cosmetic composition for topical application, comprising at least one inhibitor of the RhoA kinase production and/or activation, and also to a cosmetic process for treating the skin, especially the aged and/or wrinkled skin.